From wm65805 at hotmail.com Mon Jan 2 09:47:34 2006 From: wm65805 at hotmail.com (bill malcolm) Date: Mon, 2 Jan 2006 09:47:34 -0600 Subject: [sebhc] Re: Was there ever a Unix for h-89 ? References: <000001c601e3$5d7dd750$1f6fa8c0@eths.k12.il.us> Message-ID: Mon, 02 Jan 2006 15:50:41 +0000 HI : I was thinking building Unix for h-89 -- I have source Code for Early Unix from ATT and C also . So maybe this winter I may work on it as soon as I get my h-67 harddisk up and running. -- any suggestions. bill .. ----- Original Message ----- From: "Jack Rubin" To: Sent: Thursday, December 15, 2005 7:52 PM Subject: RE: [sebhc] H89 roms uploaded to archives > Thanks Joe! > > Zip file with MTR ROMs and a few other goodies has been moved to public > archives under software/ROMs/H89. > > Jack > > > -----Original Message----- > > From: sebhc-bounces at sebhc.org > > [mailto:sebhc-bounces at sebhc.org] On Behalf Of Joe Smith > > Sent: Thursday, December 15, 2005 5:16 PM > > To: sebhc at sebhc.org > > Subject: Re: [sebhc] H89 roms > > > > > > Finally got into the upload page, the file with 444-142 is called > > mtrs,.zip,whenever it gets posted > > > > Joe Smith > > joebandit > > jtsdadinaz > > Conbuilder debugger /Programmer > > > > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List From wm65805 at hotmail.com Mon Jan 2 09:56:15 2006 From: wm65805 at hotmail.com (bill malcolm) Date: Mon, 2 Jan 2006 09:56:15 -0600 Subject: [SPAM] [sebhc] [SPAM] Need Hard Sector disk Message-ID: Mon, 02 Jan 2006 15:59:23 +0000 HI: I could use some Hard sector disks like 20 or 30 . I never bought any back in the 80's I have most other types. bill .. -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: SpamAssassinReport.txt URL: -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: SpamAssassinReport.txt URL: From frustum at pacbell.net Mon Jan 2 11:40:46 2006 From: frustum at pacbell.net (Jim Battle) Date: Mon, 02 Jan 2006 11:40:46 -0600 Subject: [sebhc] Re: Was there ever a Unix for h-89 ? In-Reply-To: References: <000001c601e3$5d7dd750$1f6fa8c0@eths.k12.il.us> Message-ID: <43B9659E.5070907@pacbell.net> bill malcolm wrote: > HI : I was thinking building Unix for h-89 -- I have source Code for > Early Unix from ATT and C also . So maybe this winter I may work on it as > soon as I get my h-67 harddisk up and running. -- any suggestions. > bill .. Doing so would be a monumental task. I know some have taken a stab at writing unix-like OSs for Z80s, but as far as I know, none got past the toy stage. I've never used one, but UZI is one I've heard of where the source code is available (but perhaps in an indeterminate state). http://www.dougbraun.com/uzi.html Early unix systems got by on 64KB or ram or less, so it is in theory possible. Just compiling the C code on your H89 won't suffice. There would be a number of device drivers to write. Good luck! -- Delivered by the SEBHC Mailing List From wm65805 at hotmail.com Mon Jan 2 16:01:45 2006 From: wm65805 at hotmail.com (bill malcolm) Date: Mon, 2 Jan 2006 16:01:45 -0600 Subject: [SPAM] [sebhc] [SPAM] Re: [this is not spam sorry! yes I use Outlook Express OK? References: Message-ID: Mon, 02 Jan 2006 22:04:53 +0000 ----- Original Message ----- Sent: Monday, January 02, 2006 9:56 AM Subject: Need Hard Sector disk HI: I could use some Hard sector disks like 20 or 30 . I never bought any back in the 80's I have most other types. bill .. ---------------------------------------------------------------------------- ---- -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: SpamAssassinReport.txt URL: -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: SpamAssassinReport.txt URL: From dwight.elvey at amd.com Mon Jan 2 15:59:22 2006 From: dwight.elvey at amd.com (Dwight Elvey) Date: Mon, 2 Jan 2006 13:59:22 -0800 (PST) Subject: [sebhc] Re: FW: Re: Any interest in Heath H-89 (mostly HDOS) documentation? Message-ID: <200601022159.NAA31904@ca2h0430.amd.com> Hi Anyone in the Maryland area that might pick this stuff up?? Dwight >From: "dwight elvey" > > > > >>From: "Norm" >>To: >>Subject: Re: Any interest in Heath H-89 (mostly HDOS) documentation? >>Date: Mon, 2 Jan 2006 13:16:23 -0500 >> >>Dwight >> >>Maryland >> >> Norm >> >>----- Original Message ----- From: >>To: "Norm Dresner" >>Sent: Monday, January 02, 2006 12:26 PM >>Subject: Re: Any interest in Heath H-89 (mostly HDOS) documentation? >> >> >>>Hi Norm >>>What area are these located in. I suspect I can find someone >>>that would like them. >>>Dwight >>>dwight.elvey at amd.com >>> >>>Norm Dresner wrote: >>>>A friend is cleaning out his basement and found a carton with old REMark >>>>magazines and a bunch of documentation for the H-89 (mostly HDOS but some >>>>CP/M IIRC). Before he tosses is, he wants to know if there's anyone who >>>>would be interested in this type of material. >>>> >>>>You can e-mail me for a list of what he has. >>>> >>>> Norm >>> >> > > -- Delivered by the SEBHC Mailing List From wm65805 at hotmail.com Mon Jan 2 16:07:48 2006 From: wm65805 at hotmail.com (bill malcolm) Date: Mon, 2 Jan 2006 16:07:48 -0600 Subject: [sebhc] Re: Was there ever a Unix for h-89 ? References: <000001c601e3$5d7dd750$1f6fa8c0@eths.k12.il.us> <43B9659E.5070907@pacbell.net> Message-ID: Mon, 02 Jan 2006 22:10:56 +0000 thanks for the help -- I was thinking of adding some kind of Memory Mangement Hardware Maybe like the Lisa. bill.. ----- Original Message ----- From: "Jim Battle" To: Sent: Monday, January 02, 2006 11:40 AM Subject: Re: [sebhc] Re: Was there ever a Unix for h-89 ? > bill malcolm wrote: > > HI : I was thinking building Unix for h-89 -- I have source Code for > > Early Unix from ATT and C also . So maybe this winter I may work on it as > > soon as I get my h-67 harddisk up and running. -- any suggestions. > > bill .. > > Doing so would be a monumental task. I know some have taken a stab at writing > unix-like OSs for Z80s, but as far as I know, none got past the toy stage. I've > never used one, but UZI is one I've heard of where the source code is available > (but perhaps in an indeterminate state). > > http://www.dougbraun.com/uzi.html > > Early unix systems got by on 64KB or ram or less, so it is in theory possible. > Just compiling the C code on your H89 won't suffice. There would be a number of > device drivers to write. > > Good luck! > > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List From garlangr at verizon.net Mon Jan 2 16:24:56 2006 From: garlangr at verizon.net (Mark Garlanger) Date: Mon, 02 Jan 2006 16:24:56 -0600 Subject: [sebhc] Re: FW: Re: Any interest in Heath H-89 (mostly HDOS) documentation? In-Reply-To: <200601022159.NAA31904@ca2h0430.amd.com> Message-ID: <000601c60feb$5c373150$6401010a@GR390> I would be willing to pay for shipping to Texas with the 'Media Mail' rate from the post office. Mark -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Dwight Elvey Sent: Monday, January 02, 2006 3:59 PM To: sebhc at sebhc.org Cc: ndrez at att.net Subject: [sebhc] Re: FW: Re: Any interest in Heath H-89 (mostly HDOS) documentation? Hi Anyone in the Maryland area that might pick this stuff up?? Dwight >From: "dwight elvey" > > > > >>From: "Norm" >>To: >>Subject: Re: Any interest in Heath H-89 (mostly HDOS) documentation? >>Date: Mon, 2 Jan 2006 13:16:23 -0500 >> >>Dwight >> >>Maryland >> >> Norm >> >>----- Original Message ----- From: >>To: "Norm Dresner" >>Sent: Monday, January 02, 2006 12:26 PM >>Subject: Re: Any interest in Heath H-89 (mostly HDOS) documentation? >> >> >>>Hi Norm >>>What area are these located in. I suspect I can find someone >>>that would like them. >>>Dwight >>>dwight.elvey at amd.com >>> >>>Norm Dresner wrote: >>>>A friend is cleaning out his basement and found a carton with old REMark >>>>magazines and a bunch of documentation for the H-89 (mostly HDOS but some >>>>CP/M IIRC). Before he tosses is, he wants to know if there's anyone who >>>>would be interested in this type of material. >>>> >>>>You can e-mail me for a list of what he has. >>>> >>>> Norm >>> >> > > -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From davidwallace2000 at comcast.net Tue Jan 3 09:38:36 2006 From: davidwallace2000 at comcast.net (davidwallace2000 at comcast.net) Date: Tue, 03 Jan 2006 15:38:36 +0000 Subject: [sebhc] Hello! Just joined the mailing list Message-ID: <010320061538.2911.43BA9A7C00053A0700000B5F2205886360CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> An embedded and charset-unspecified text was scrubbed... Name: not available URL: From RONALD.S.WEST at saic.com Tue Jan 3 11:19:21 2006 From: RONALD.S.WEST at saic.com (West, Ronald S.) Date: Tue, 3 Jan 2006 12:19:21 -0500 Subject: [sebhc] Re: FW: Re: Any interest in Heath H-89 (mostly HDOS) documentation? Message-ID: <9CE060225CD128408F0B549B0A6B26BC01ED0ABD@0015-its-exmb01.us.saic.com> Dwight, I am in Northern Virginia and would be interested in picking up the REMark stuff if you don't want to ship it. Ron wb4oum at aol.com -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Dwight Elvey Sent: Monday, January 02, 2006 4:59 PM To: sebhc at sebhc.org Cc: ndrez at att.net Subject: [sebhc] Re: FW: Re: Any interest in Heath H-89 (mostly HDOS) documentation? Hi Anyone in the Maryland area that might pick this stuff up?? Dwight >From: "dwight elvey" > > > > >>From: "Norm" >>To: >>Subject: Re: Any interest in Heath H-89 (mostly HDOS) documentation? >>Date: Mon, 2 Jan 2006 13:16:23 -0500 >> >>Dwight >> >>Maryland >> >> Norm >> >>----- Original Message ----- From: >>To: "Norm Dresner" >>Sent: Monday, January 02, 2006 12:26 PM >>Subject: Re: Any interest in Heath H-89 (mostly HDOS) documentation? >> >> >>>Hi Norm >>>What area are these located in. I suspect I can find someone that >>>would like them. Dwight >>>dwight.elvey at amd.com >>> >>>Norm Dresner wrote: >>>>A friend is cleaning out his basement and found a carton with old >>>>REMark magazines and a bunch of documentation for the H-89 (mostly >>>>HDOS but some CP/M IIRC). Before he tosses is, he wants to know if >>>>there's anyone who would be interested in this type of material. >>>> >>>>You can e-mail me for a list of what he has. >>>> >>>> Norm >>> >> > > -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From dwight.elvey at amd.com Tue Jan 3 11:33:24 2006 From: dwight.elvey at amd.com (Dwight Elvey) Date: Tue, 3 Jan 2006 09:33:24 -0800 (PST) Subject: [sebhc] Re: FW: Re: Any interest in Heath H-89 (mostly HDOS) documentation? Message-ID: <200601031733.JAA24837@ca2h0430.amd.com> Hi You need to respond to: "Norm" I was just passing it on. It seems that he was overwelmed with responses and expects to put items on ebay. Later Dwight >From: "West, Ronald S." > >Dwight, > >I am in Northern Virginia and would be interested in picking up the REMark >stuff if you don't want to ship it. > >Ron >wb4oum at aol.com > >-----Original Message----- >From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of >Dwight Elvey >Sent: Monday, January 02, 2006 4:59 PM >To: sebhc at sebhc.org >Cc: ndrez at att.net >Subject: [sebhc] Re: FW: Re: Any interest in Heath H-89 (mostly HDOS) >documentation? > > >Hi > Anyone in the Maryland area that might pick this stuff >up?? >Dwight > > >>From: "dwight elvey" >> >> >> >> >>>From: "Norm" >>>To: >>>Subject: Re: Any interest in Heath H-89 (mostly HDOS) documentation? >>>Date: Mon, 2 Jan 2006 13:16:23 -0500 >>> >>>Dwight >>> >>>Maryland >>> >>> Norm >>> >>>----- Original Message ----- From: >>>To: "Norm Dresner" >>>Sent: Monday, January 02, 2006 12:26 PM >>>Subject: Re: Any interest in Heath H-89 (mostly HDOS) documentation? >>> >>> >>>>Hi Norm >>>>What area are these located in. I suspect I can find someone that >>>>would like them. Dwight >>>>dwight.elvey at amd.com >>>> >>>>Norm Dresner wrote: >>>>>A friend is cleaning out his basement and found a carton with old >>>>>REMark magazines and a bunch of documentation for the H-89 (mostly >>>>>HDOS but some CP/M IIRC). Before he tosses is, he wants to know if >>>>>there's anyone who would be interested in this type of material. >>>>> >>>>>You can e-mail me for a list of what he has. >>>>> >>>>> Norm >>>> >>> >> >> > > >-- >Delivered by the SEBHC Mailing List >-- >Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From jack.rubin at ameritech.net Tue Jan 3 15:24:56 2006 From: jack.rubin at ameritech.net (Jack Rubin) Date: Tue, 3 Jan 2006 15:24:56 -0600 Subject: [sebhc] Hello! Just joined the mailing list In-Reply-To: <010320061538.2911.43BA9A7C00053A0700000B5F2205886360CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> Message-ID: <000001c610ac$2549ca10$1f6fa8c0@eths.k12.il.us> Dave, Glad to have you onboard - your H8 project was a major inspiration for setting up the SEBHC archive. Jack > -----Original Message----- > From: sebhc-bounces at sebhc.org > [mailto:sebhc-bounces at sebhc.org] On Behalf Of > davidwallace2000 at comcast.net > Sent: Tuesday, January 03, 2006 9:39 AM > To: sebhc at sebhc.org > Subject: [sebhc] Hello! Just joined the mailing list > > > Thanks to Bill Malcolm for telling me about this list and archive. > > Now that I've seen in print a statement about the HDOS > copyright status, I guess I've got an incentive to do more > work on my Tehcnopaleontology site again. > > -- Dave Wallace > http://wa1gsf.home.comcast.net > > H8 Emulation for Windows (incomplete but functioning if you > use the archived ROM files) REMark tables of contents (about > half the issues so far) Considerable technical reference > material for the H8 > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List From davidwallace2000 at comcast.net Tue Jan 3 16:19:21 2006 From: davidwallace2000 at comcast.net (davidwallace2000 at comcast.net) Date: Tue, 03 Jan 2006 22:19:21 +0000 Subject: [sebhc] Hello! Just joined the mailing list Message-ID: <010320062219.26259.43BAF8690008C8E8000066932207021573CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> An embedded and charset-unspecified text was scrubbed... Name: not available URL: From jack.rubin at ameritech.net Tue Jan 3 18:04:35 2006 From: jack.rubin at ameritech.net (Jack Rubin) Date: Tue, 3 Jan 2006 18:04:35 -0600 Subject: [sebhc] Hello! Just joined the mailing list In-Reply-To: <010320062219.26259.43BAF8690008C8E8000066932207021573CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> Message-ID: <000001c610c2$72dd1870$1f6fa8c0@eths.k12.il.us> Well, I think we did correspond a couple of times a few years back but it may have been pre-SEBHC. BTW, the reason the archive is "private" is to provide an indicator of "good faith" in the case of intellectual property issues. > -----Original Message----- > From: sebhc-bounces at sebhc.org > [mailto:sebhc-bounces at sebhc.org] On Behalf Of > davidwallace2000 at comcast.net > Sent: Tuesday, January 03, 2006 4:19 PM > To: sebhc at sebhc.org > Cc: sebhc at sebhc.org > Subject: RE: [sebhc] Hello! Just joined the mailing list > > > Ha! Too bad you didn't drop me a line -- I just found out > about this a couple of days ago. :) > > -------------- Original message -------------- > From: "Jack Rubin" > > > Dave, > > > > Glad to have you onboard - your H8 project was a major > inspiration for > > setting up the SEBHC archive. > > > > Jack > > > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List From leeahart at earthlink.net Tue Jan 3 19:18:28 2006 From: leeahart at earthlink.net (Lee Hart) Date: Tue, 03 Jan 2006 17:18:28 -0800 Subject: [sebhc] Re: Was there ever a Unix for h-89 ? References: <000001c601e3$5d7dd750$1f6fa8c0@eths.k12.il.us> <43B9659E.5070907@pacbell.net> Message-ID: <43BB2264.72E5@earthlink.net> bill malcolm wrote: > I was thinking building Unix for h-89 -- I have source code for > early Unix from ATT and C also... I was thinking of adding some > kind of Memory Mangement Hardware... A lot depends on what you mean by "unix". Today, people think of linux, which is a gargantuan package, thousands of times too big for an H89. But decades ago, unix was just another operating system; somewhat larger than CP/M and HDOS, but still possible to run on a small computer. The H89 is as capable as many of the minicomputers that ran unix back then. One thing that helps a lot is to make it a single-user system. There were a number of companies that made unix-like "shells" for CP/M. This gives you something that behaves like unix at the command prompt, though the underlying file system is unchanged. There were unix-like operating systems like minix and xenix that ran on Z80 computers. Did these ever get implemented on the H89? -- Ring the bells that you can ring Forget the perfect offering There is a crack in everything That's how the light gets in -- Leonard Cohen -- Lee A. Hart 814 8th Ave N Sartell MN 56377 leeahart_ at _earthlink.net -- Delivered by the SEBHC Mailing List From sp11 at hotmail.com Tue Jan 3 23:20:09 2006 From: sp11 at hotmail.com (Steven Parker) Date: Wed, 04 Jan 2006 05:20:09 +0000 Subject: [sebhc] Re: Unix for H-8/H-89 ? In-Reply-To: <43BB2264.72E5@earthlink.net> Message-ID: Wed, 04 Jan 2006 05:20:09 GMT At ZDS I had worked on putting Unix v6 on the Z100 (but never finished). What got me excited about doing it was the protected mode of the 286 chip, and it's support for virtual memory (and a larger memory capacity overall). The Z-80 and 8080 chips didn't have harware support for paging. A Unix, or even minix (cut-down unix), for H8's and/or 89's would be very cool even if not resistant to crashing due to bad applications. If you're working from v.6 sources, I recall them being pretty compact. And if you wanted help, perhaps if you set up a CVS archive somewhere, a few folks may want to pitch in. :-) -- Steven -- Delivered by the SEBHC Mailing List From Watzman at neo.rr.com Tue Jan 3 23:31:47 2006 From: Watzman at neo.rr.com (Barry Watzman) Date: Wed, 4 Jan 2006 00:31:47 -0500 Subject: [sebhc] Re: Unix for H-8/H-89 ? In-Reply-To: Message-ID: <007801c610f0$33855790$6601a8c0@barry> The Z-100 doesn't have a 286. Or were you working on the 286-based Z-100 that Babu [Rajaram] was working on, but that never saw the light of production. [Surprise .... yes, there was such a creature, but only in the labs.] -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Steven Parker Sent: Wednesday, January 04, 2006 12:20 AM To: sebhc at sebhc.org Subject: [sebhc] Re: Unix for H-8/H-89 ? At ZDS I had worked on putting Unix v6 on the Z100 (but never finished). What got me excited about doing it was the protected mode of the 286 chip, and it's support for virtual memory (and a larger memory capacity overall). The Z-80 and 8080 chips didn't have harware support for paging. A Unix, or even minix (cut-down unix), for H8's and/or 89's would be very cool even if not resistant to crashing due to bad applications. If you're working from v.6 sources, I recall them being pretty compact. And if you wanted help, perhaps if you set up a CVS archive somewhere, a few folks may want to pitch in. :-) -- Steven -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From sp11 at hotmail.com Tue Jan 3 23:48:02 2006 From: sp11 at hotmail.com (Steven Parker) Date: Wed, 04 Jan 2006 05:48:02 +0000 Subject: [sebhc] Welcome David Wallace! In-Reply-To: <010320062219.26259.43BAF8690008C8E8000066932207021573CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> Message-ID: Wed, 04 Jan 2006 05:48:02 GMT David Wallace wrote: >Ha! Too bad you didn't drop me a line -- I just found out about this a >couple of days ago. :) A couple of us did try to contact you almost 2 years ago. We were hoping to encourage you to finish the diskette simulation for your virtual H-8. I was also thinking it would be very cool if it had a switchable "pristine" mode (original CPU vs. the H-8-37). In the meantime the "other" Dave made us a really nifty DOS-based H-8 simulator complete with H-17's. I had also tried writing you in response to this comment on your HUG info page: >17 "Connecting Multiple RS-232 Devices in Parallel" by "/AIWZ/" [Anyone >know who this was? The "signature" appears in some HDOS code listings, >too.] I happen to be /AIWZ/, and also the author of HUG's "Consultant's Corner" column. And you probably already know me as the author of PAM-37. (My name is in the ROM). By the way, I identified my HUG software with "/AIWZ/" to prevent customers seeking me out for HUG-related questions when I was handling Tech correspondence for the computer products. Welcome to SEBHC, and let me know if your interest in the virtual H-8 is rekindled .. I have a few more suggestions for it. :-) -- Steven -- Delivered by the SEBHC Mailing List From sp11 at hotmail.com Tue Jan 3 23:59:45 2006 From: sp11 at hotmail.com (Steven Parker) Date: Wed, 04 Jan 2006 05:59:45 +0000 Subject: [sebhc] Babu's Z-100 In-Reply-To: <007801c610f0$33855790$6601a8c0@barry> Message-ID: Wed, 04 Jan 2006 05:59:45 GMT Barry wrote: >The Z-100 doesn't have a 286. > >Or were you working on the 286-based Z-100 that Babu [Rajaram] was working >on, but that never saw the light of production. That was the one. I forgot to mention that it was not a PRODUCTION Z-100. But both Babu's 286 mod and my Unix port were intended (wishfully) for eventual production. In both cases, somebody (was it somebarry? :-) ) decided it was not to be. :( -- Steven -- Delivered by the SEBHC Mailing List From billwilkinson at mindspring.com Wed Jan 4 01:20:12 2006 From: billwilkinson at mindspring.com (William Wilkinson) Date: Wed, 4 Jan 2006 01:20:12 -0600 Subject: [sebhc] Welcome David Wallace! Message-ID: <380-2200613472012625@mindspring.com> > [Original Message] > From: Steven Parker > To: > Date: 1/3/2006 11:48:02 PM > Subject: [sebhc] Welcome David Wallace! [snip] > I happen to be /AIWZ/, and also the author of HUG's "Consultant's Corner" > column. And you probably already know me as the author of PAM-37. (My > name is in the ROM). > > By the way, I identified my HUG software with "/AIWZ/" to prevent customers > seeking me out for HUG-related questions when I was handling Tech > correspondence for the computer products. Steven, Since you've mentioned that here, should I now update your bio at http://ww_heco.home.mindspring.com/heaple.html with the /AIWZ/ information? --Bill -- Delivered by the SEBHC Mailing List From davidwallace2000 at comcast.net Wed Jan 4 06:09:50 2006 From: davidwallace2000 at comcast.net (davidwallace2000 at comcast.net) Date: Wed, 04 Jan 2006 12:09:50 +0000 Subject: [sebhc] Welcome David Wallace! Message-ID: <010420061209.26086.43BBBB0E000C0B65000065E62207021553CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> An embedded and charset-unspecified text was scrubbed... Name: not available URL: From Watzman at neo.rr.com Wed Jan 4 09:23:37 2006 From: Watzman at neo.rr.com (Barry Watzman) Date: Wed, 4 Jan 2006 10:23:37 -0500 Subject: [sebhc] Babu's Z-100 In-Reply-To: Message-ID: <005301c61142$debefc90$6601a8c0@barry> No, I had left Heath / Zenith long before that. -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Steven Parker Sent: Wednesday, January 04, 2006 1:00 AM To: sebhc at sebhc.org Subject: [sebhc] Babu's Z-100 Barry wrote: >The Z-100 doesn't have a 286. > >Or were you working on the 286-based Z-100 that Babu [Rajaram] was working >on, but that never saw the light of production. That was the one. I forgot to mention that it was not a PRODUCTION Z-100. But both Babu's 286 mod and my Unix port were intended (wishfully) for eventual production. In both cases, somebody (was it somebarry? :-) ) decided it was not to be. :( -- Steven -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From sp11 at hotmail.com Wed Jan 4 13:40:35 2006 From: sp11 at hotmail.com (Steven Parker) Date: Wed, 04 Jan 2006 19:40:35 +0000 Subject: [sebhc] H8 software & document archives In-Reply-To: <010420061209.26086.43BBBB0E000C0B65000065E62207021553CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> Message-ID: Wed, 04 Jan 2006 19:40:35 GMT David (W) wrote:, >... I don't have as easy access to the PAMGO code as I did to the Z80 >"bios". Now you do .. from the SEBHC archives! http://www.sebhc.org/archive/software/ROMs/ (ID=heathkit, PW=hdos8bit) But .. remember that PAM8GO isn't quite "pristine" (PAM-8 was the standard H-8 ROM). There's also PAM8AT for instant-on boot. I use that one with Dave D.'s emulator to quick-start HDOS. -- Steven (/AIWZ/ :-) ) -- Delivered by the SEBHC Mailing List From dwight.elvey at amd.com Wed Jan 4 16:34:22 2006 From: dwight.elvey at amd.com (Dwight Elvey) Date: Wed, 4 Jan 2006 14:34:22 -0800 (PST) Subject: [sebhc] H-11 Message-ID: <200601042234.OAA06705@ca2h0430.amd.com> Hi I've gotten a couple of H-11 boxes. One has three boards in and the other has none. Does anyone know what boards were normally configured with the H-11? Thanks Dwight -- Delivered by the SEBHC Mailing List From Watzman at neo.rr.com Wed Jan 4 17:11:36 2006 From: Watzman at neo.rr.com (Barry Watzman) Date: Wed, 4 Jan 2006 18:11:36 -0500 Subject: [sebhc] H-11 In-Reply-To: <200601042234.OAA06705@ca2h0430.amd.com> Message-ID: <00cc01c61184$3eeb96a0$6601a8c0@barry> CPU, memory (possibly several), I/O cards (serial and/or parallel), Floppy disk controller (H-27). The H-27 controller is really a parallel interface card, the "real" controller was in the drive box. Barry Watzman -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Dwight Elvey Sent: Wednesday, January 04, 2006 5:34 PM To: sebhc at sebhc.org Subject: [sebhc] H-11 Hi I've gotten a couple of H-11 boxes. One has three boards in and the other has none. Does anyone know what boards were normally configured with the H-11? Thanks Dwight -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From dwight.elvey at amd.com Wed Jan 4 17:21:19 2006 From: dwight.elvey at amd.com (Dwight Elvey) Date: Wed, 4 Jan 2006 15:21:19 -0800 (PST) Subject: [sebhc] H-11 Message-ID: <200601042321.PAA08003@ca2h0430.amd.com> Hi Barry I'll need the part numbers found on the ears? I wouldn't know a serial card from a cpu card for one of these. Dwight >From: "Barry Watzman" > >CPU, memory (possibly several), I/O cards (serial and/or parallel), Floppy >disk controller (H-27). > >The H-27 controller is really a parallel interface card, the "real" >controller was in the drive box. > >Barry Watzman > > >-----Original Message----- >From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of >Dwight Elvey >Sent: Wednesday, January 04, 2006 5:34 PM >To: sebhc at sebhc.org >Subject: [sebhc] H-11 > >Hi > I've gotten a couple of H-11 boxes. One has three >boards in and the other has none. Does anyone know >what boards were normally configured with the H-11? >Thanks >Dwight > > >-- >Delivered by the SEBHC Mailing List > > >-- >Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From Watzman at neo.rr.com Wed Jan 4 18:09:05 2006 From: Watzman at neo.rr.com (Barry Watzman) Date: Wed, 4 Jan 2006 19:09:05 -0500 Subject: [sebhc] H-11 In-Reply-To: <200601042321.PAA08003@ca2h0430.amd.com> Message-ID: <00db01c6118c$3de48d40$6601a8c0@barry> I don't have that information. Sorry. The CPU card should be obvious, as should memory cards. If you have an old (VERY old) Heath catalog, you may be able to identify it from photos in the catalog. -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Dwight Elvey Sent: Wednesday, January 04, 2006 6:21 PM To: sebhc at sebhc.org Subject: RE: [sebhc] H-11 Hi Barry I'll need the part numbers found on the ears? I wouldn't know a serial card from a cpu card for one of these. Dwight >From: "Barry Watzman" > >CPU, memory (possibly several), I/O cards (serial and/or parallel), Floppy >disk controller (H-27). > >The H-27 controller is really a parallel interface card, the "real" >controller was in the drive box. > >Barry Watzman > > >-----Original Message----- >From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of >Dwight Elvey >Sent: Wednesday, January 04, 2006 5:34 PM >To: sebhc at sebhc.org >Subject: [sebhc] H-11 > >Hi > I've gotten a couple of H-11 boxes. One has three >boards in and the other has none. Does anyone know >what boards were normally configured with the H-11? >Thanks >Dwight > > >-- >Delivered by the SEBHC Mailing List > > >-- >Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From paulpenn at knology.net Wed Jan 4 19:10:43 2006 From: paulpenn at knology.net (Paul A. Pennington) Date: Wed, 4 Jan 2006 20:10:43 -0500 Subject: [sebhc] H-11 References: <200601042321.PAA08003@ca2h0430.amd.com> Message-ID: <005901c61194$da2c34c0$6401a8c0@A31PAUL> Dwight > I'll need the part numbers found on the ears? > I wouldn't know a serial card from a cpu card for > one of these. You can look up your card numbers on this list: http://world.std.com/~mbg/pdp11-field-guide.txt Paul Pennington Augusta, Georgia -- Delivered by the SEBHC Mailing List From garlangr at verizon.net Wed Jan 4 21:22:50 2006 From: garlangr at verizon.net (Mark Garlanger) Date: Wed, 04 Jan 2006 21:22:50 -0600 Subject: [sebhc] H-11 In-Reply-To: <00db01c6118c$3de48d40$6601a8c0@barry> Message-ID: <000601c611a7$4f2fc860$6401010a@GR390> I have a Spring/Summer 1982 catalog, but it doesn't show any pictures of the boards, the list of boards that I see are: WHA-11-16 32K Byte Expansion Module H-11-5 Serial Interface Kit H-11-2 Parallel Interface H-11-10 Wire Wrapping Board The only other hardware items that I see for the H11 are: 830-35 - Line Time Clock Switch Modification Kit ( places the LTC switch on the front panel) H-11-6 Extended Arithmetic Chip - adds fixed point mult, div, and extended shifts. (40 pin IC). Mark -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Barry Watzman Sent: Wednesday, January 04, 2006 6:09 PM To: sebhc at sebhc.org Subject: RE: [sebhc] H-11 I don't have that information. Sorry. The CPU card should be obvious, as should memory cards. If you have an old (VERY old) Heath catalog, you may be able to identify it from photos in the catalog. -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Dwight Elvey Sent: Wednesday, January 04, 2006 6:21 PM To: sebhc at sebhc.org Subject: RE: [sebhc] H-11 Hi Barry I'll need the part numbers found on the ears? I wouldn't know a serial card from a cpu card for one of these. Dwight >From: "Barry Watzman" > >CPU, memory (possibly several), I/O cards (serial and/or parallel), Floppy >disk controller (H-27). > >The H-27 controller is really a parallel interface card, the "real" >controller was in the drive box. > >Barry Watzman > > >-----Original Message----- >From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of >Dwight Elvey >Sent: Wednesday, January 04, 2006 5:34 PM >To: sebhc at sebhc.org >Subject: [sebhc] H-11 > >Hi > I've gotten a couple of H-11 boxes. One has three >boards in and the other has none. Does anyone know >what boards were normally configured with the H-11? >Thanks >Dwight > > >-- >Delivered by the SEBHC Mailing List > > >-- >Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From dwight.elvey at amd.com Thu Jan 5 18:34:42 2006 From: dwight.elvey at amd.com (Dwight Elvey) Date: Thu, 5 Jan 2006 16:34:42 -0800 (PST) Subject: [sebhc] H-11 Message-ID: <200601060034.QAA15251@ca2h0430.amd.com> >From: "Mark Garlanger" > >I have a Spring/Summer 1982 catalog, but it doesn't show any pictures of the >boards, the list of boards that I see are: > >WHA-11-16 32K Byte Expansion Module >H-11-5 Serial Interface Kit >H-11-2 Parallel Interface >H-11-10 Wire Wrapping Board Hi Now if I could correlate these to DEC numbers I'd have it. Does anyone in the group have an H-11 that they could peak under the covers? Dwight > >The only other hardware items that I see for the H11 are: >830-35 - Line Time Clock Switch Modification Kit ( places the LTC switch on >the front panel) >H-11-6 Extended Arithmetic Chip - adds fixed point mult, div, and extended >shifts. (40 pin IC). > >Mark > > >-----Original Message----- >From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of >Barry Watzman >Sent: Wednesday, January 04, 2006 6:09 PM >To: sebhc at sebhc.org >Subject: RE: [sebhc] H-11 > >I don't have that information. Sorry. The CPU card should be obvious, as >should memory cards. If you have an old (VERY old) Heath catalog, you may >be able to identify it from photos in the catalog. > > >-----Original Message----- >From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of >Dwight Elvey >Sent: Wednesday, January 04, 2006 6:21 PM >To: sebhc at sebhc.org >Subject: RE: [sebhc] H-11 > >Hi Barry > I'll need the part numbers found on the ears? >I wouldn't know a serial card from a cpu card for >one of these. >Dwight > >>From: "Barry Watzman" >> >>CPU, memory (possibly several), I/O cards (serial and/or parallel), Floppy >>disk controller (H-27). >> >>The H-27 controller is really a parallel interface card, the "real" >>controller was in the drive box. >> >>Barry Watzman >> >> >>-----Original Message----- >>From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of >>Dwight Elvey >>Sent: Wednesday, January 04, 2006 5:34 PM >>To: sebhc at sebhc.org >>Subject: [sebhc] H-11 >> >>Hi >> I've gotten a couple of H-11 boxes. One has three >>boards in and the other has none. Does anyone know >>what boards were normally configured with the H-11? >>Thanks >>Dwight >> >> >>-- >>Delivered by the SEBHC Mailing List >> >> >>-- >>Delivered by the SEBHC Mailing List > > >-- >Delivered by the SEBHC Mailing List > > >-- >Delivered by the SEBHC Mailing List > >-- >Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From tw at timothyweber.org Thu Jan 5 20:05:40 2006 From: tw at timothyweber.org (Timothy Weber) Date: Thu, 05 Jan 2006 21:05:40 -0500 Subject: [sebhc] ET-3400 interest? Message-ID: <43BDD074.10509@timothyweber.org> Hi, folks! It's been interesting and enlightening reading all about the H-11 etc. I joined this list a few weeks ago after buying an ET-3400 Microcomputer Training System on eBay. I borrowed one from about 1979 (when I was in fourth grade) through 1982, and it was my first real programming experience. I decided to get one again in a fit of nostalgia. I figure making it do something practical is probably pointless, but I do want to get some kind of demo program running on it, just to show it off. But of course, one of the big limitations of the thing was that it had no persistent storage, unless you got the ETA-3400 expansion unit and hooked it up to a cassette player, in which case you got only slightly persistent storage. ;) So, my fun project is to add some EEPROM to it, just so I can load and run some demos. It seems pretty simple; I'm just waiting to add the EEPROM into a big parts order in a couple weeks. My question is: Is there any interest in the ET-3400 on this list? If so, great. I just don't want to bore the folks who are into its obviously superior big brother. :) Cheers. -- Timothy J. Weber http://timothyweber.org -- Delivered by the SEBHC Mailing List From billwilkinson at mindspring.com Thu Jan 5 20:48:53 2006 From: billwilkinson at mindspring.com (William Wilkinson) Date: Thu, 5 Jan 2006 20:48:53 -0600 Subject: [sebhc] ET-3400 interest? Message-ID: <380-2200615624853171@mindspring.com> Now that you mention it, I'd like to see a discussion on it--and possibly contribute to. It is, after all, an 8-bit machine; which would seem to fit in with this group. My ET-3400 has been gathering dust for years. It would be interesting to get it going again and see what I could make it do with its fully-loaded 512 bytes of RAM. --Bill > [Original Message] > From: Timothy Weber > To: > Date: 1/5/2006 8:16:08 PM > Subject: [sebhc] ET-3400 interest? > > Hi, folks! It's been interesting and enlightening reading all about the > H-11 etc. > > I joined this list a few weeks ago after buying an ET-3400 Microcomputer > Training System on eBay. I borrowed one from about 1979 (when I was in > fourth grade) through 1982, and it was my first real programming > experience. I decided to get one again in a fit of nostalgia. > > I figure making it do something practical is probably pointless, but I > do want to get some kind of demo program running on it, just to show it > off. But of course, one of the big limitations of the thing was that it > had no persistent storage, unless you got the ETA-3400 expansion unit > and hooked it up to a cassette player, in which case you got only > slightly persistent storage. ;) > > So, my fun project is to add some EEPROM to it, just so I can load and > run some demos. It seems pretty simple; I'm just waiting to add the > EEPROM into a big parts order in a couple weeks. > > My question is: Is there any interest in the ET-3400 on this list? If > so, great. I just don't want to bore the folks who are into its > obviously superior big brother. :) > > Cheers. > -- > Timothy J. Weber > http://timothyweber.org > -- > Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From paulpenn at knology.net Fri Jan 6 08:50:50 2006 From: paulpenn at knology.net (Paul A. Pennington) Date: Fri, 6 Jan 2006 09:50:50 -0500 Subject: [sebhc] ET-3400 interest? References: <380-2200615624853171@mindspring.com> Message-ID: <003001c612d0$972faf20$6401a8c0@A31PAUL> Me three... I'd like jangle some very old brain cells by writing a little 6800 machine code and doing some projects on my ET-3400. Those with Motorola Evaluation Kits (D-1 or D-2) might join in also, with modifications for different I/O. Paul Pennington Augusta, Georgia -- Delivered by the SEBHC Mailing List From davidwallace2000 at comcast.net Fri Jan 6 09:11:24 2006 From: davidwallace2000 at comcast.net (davidwallace2000 at comcast.net) Date: Fri, 06 Jan 2006 15:11:24 +0000 Subject: [sebhc] ET-3400 interest? Message-ID: <010620061511.20819.43BE889C0008F853000051532207024553CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> An embedded and charset-unspecified text was scrubbed... Name: not available URL: From tw at timothyweber.org Fri Jan 6 11:13:00 2006 From: tw at timothyweber.org (Timothy Weber) Date: Fri, 06 Jan 2006 12:13:00 -0500 Subject: [sebhc] ET-3400 interest? In-Reply-To: <010620061511.20819.43BE889C0008F853000051532207024553CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> References: <010620061511.20819.43BE889C0008F853000051532207024553CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> Message-ID: <43BEA51C.5000108@timothyweber.org> davidwallace2000 at comcast.net wrote: > Yeesh! I remember that beast. I borrowed one for a week when I went on vacation one year. (It was something to play with because I couldn't take my H8.) I forget exactly what I programmed it to do, but it was my first and only attempt to write code in 6800 machine language. It was certainly not the introductory programming experience I'd recommend to a novice now... though it certainly started me off with a good understanding of the hardware! Paul A. Pennington wrote: > Me three... > > I'd like jangle some very old brain cells by writing a little 6800 > machine code and doing some projects on my ET-3400. Those with Motorola > Evaluation Kits (D-1 or D-2) might join in also, with modifications for > different I/O. What are those? William Wilkinson wrote: > My ET-3400 has been gathering dust for years. It would be interesting to > get it going again and see what I could make it do with its fully-loaded > 512 bytes of RAM. I'm trying to talk myself out of the impulse to build a whole new machine around it - could easily add a serial port, A/D, etc., but it seems to push the limits of utility! - and instead focus on just adding persistent storage. Though the sheer perversity of expanding its capabilities might be fun too. So my current plan is to use an Atmel 8K EEPROM, which was just the smallest parallel EEPROM I happened to find quickly. I've got the address decoder set up and working to pull a line low when any address in the 0x8000 range is on the bus, and I think all that remains is to get the chip, plug it into the lower 13 address lines and data bus, hook its enable line to the decoder's output, and connect its R/W line. Then I expect to just be able to write bytes into the EEPROM at that address block using the monitor ROM. I'll probably write one "Copy block" routine, to input a start, end, and destination address, and copy the bytes over, waiting for the EEPROM to finish writing where necessary. Reading should "just work." Once that's in, it should be easy to put new code anywhere in that (gargantuan!) 8K address space, using the lower 512 KB as a scratchpad. Or, for the realistic feel, I could run a routine out of the EEPROM that would copy the "real" program down into RAM first, just so I could say it was really running on the old hardware and only using the modern stuff for persistence. Adding a serial port so I could write in C on a PC, compile, assemble, link, and download the object code to the EEPROM seems... cool but excessive. Any thoughts? -- Timothy J. Weber http://timothyweber.org -- Delivered by the SEBHC Mailing List From Watzman at neo.rr.com Fri Jan 6 11:35:17 2006 From: Watzman at neo.rr.com (Barry Watzman) Date: Fri, 6 Jan 2006 12:35:17 -0500 Subject: [sebhc] Siemens Drive Terminator In-Reply-To: <43BEA51C.5000108@timothyweber.org> Message-ID: <008501c612e7$9ac2c980$6601a8c0@barry> I either need a terminator, a source for a terminator, or a terminator description sufficient to allow me to make my own terminator from discreet parts for one of the Wangco / Siemens drives used in the H-17 and the H-89 (the earlier, single-sided drives with the "full face" door). Does anyone have this information? Barry Watzman Watzman at neo.rr.com -- Delivered by the SEBHC Mailing List From bandit1921 at cox.net Fri Jan 6 12:02:23 2006 From: bandit1921 at cox.net (Joe Smith) Date: Fri, 6 Jan 2006 13:02:23 -0500 Subject: [sebhc] Siemens Drive Terminator Message-ID: <20060106180539.NLTL20441.fed1rmmtao10.cox.net@[172.18.180.8]> You should be able to still find them in a local parts house,I think they are 220 ohm packs.. > > From: "Barry Watzman" > Date: 2006/01/06 Fri PM 12:35:17 EST > To: > Subject: [sebhc] Siemens Drive Terminator > > > I either need a terminator, a source for a terminator, or a terminator > description sufficient to allow me to make my own terminator from discreet > parts for one of the Wangco / Siemens drives used in the H-17 and the H-89 > (the earlier, single-sided drives with the "full face" door). > > Does anyone have this information? > > Barry Watzman > Watzman at neo.rr.com > > > > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List From davidwallace2000 at comcast.net Fri Jan 6 12:23:23 2006 From: davidwallace2000 at comcast.net (davidwallace2000 at comcast.net) Date: Fri, 06 Jan 2006 18:23:23 +0000 Subject: [sebhc] Siemens Drive Terminator Message-ID: <010620061823.18068.43BEB59B000892E6000046942200734748CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> An embedded and charset-unspecified text was scrubbed... Name: not available URL: From Watzman at neo.rr.com Fri Jan 6 12:58:04 2006 From: Watzman at neo.rr.com (Barry Watzman) Date: Fri, 6 Jan 2006 13:58:04 -0500 Subject: [sebhc] Siemens Drive Terminator In-Reply-To: <20060106180539.NLTL20441.fed1rmmtao10.cox.net@[172.18.180.8]> Message-ID: <009501c612f3$291dce90$6601a8c0@barry> But what is the configuration .... how many pins, which pin(s) are common .... there were different configurations of resistor terminator packs. Anyone have a schematic of the drive? Or want to take an Ohmmeter to a pack? I do know that the terminators were a stock part, and if I have the right information, I can buy one (but it might be a 25 cent part with a $25 minimum order and a $7 minimum shipping cost). -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Joe Smith Sent: Friday, January 06, 2006 1:02 PM To: sebhc at sebhc.org Subject: Re: [sebhc] Siemens Drive Terminator You should be able to still find them in a local parts house,I think they are 220 ohm packs.. > > From: "Barry Watzman" > Date: 2006/01/06 Fri PM 12:35:17 EST > To: > Subject: [sebhc] Siemens Drive Terminator > > > I either need a terminator, a source for a terminator, or a terminator > description sufficient to allow me to make my own terminator from discreet > parts for one of the Wangco / Siemens drives used in the H-17 and the H-89 > (the earlier, single-sided drives with the "full face" door). > > Does anyone have this information? > > Barry Watzman > Watzman at neo.rr.com > > > > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From bandit1921 at cox.net Fri Jan 6 13:17:31 2006 From: bandit1921 at cox.net (Joe Smith) Date: Fri, 6 Jan 2006 14:17:31 -0500 Subject: [sebhc] Siemens Drive Terminator Message-ID: <20060106192015.EHJW17006.fed1rmmtao02.cox.net@[172.18.180.8]> 132 is the impedance,I found my old Siemens OEM book,maybe i'll scan and upload to the acrhive.. > > From: davidwallace2000 at comcast.net > Date: 2006/01/06 Fri PM 01:23:23 EST > To: sebhc at sebhc.org, > CC: "Barry Watzman" > Subject: Re: [sebhc] Siemens Drive Terminator > > According to my documentation, it was 132 ohms. 120 would probably work fine. > > -------------- Original message -------------- > From: "Barry Watzman" > > > > > I either need a terminator, a source for a terminator, or a terminator > > description sufficient to allow me to make my own terminator from discreet > > parts for one of the Wangco / Siemens drives used in the H-17 and the H-89 > > (the earlier, single-sided drives with the "full face" door). > > > > Does anyone have this information? > > > > Barry Watzman > > Watzman at neo.rr.com > > > > > > > > -- > > Delivered by the SEBHC Mailing List > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List From bandit1921 at cox.net Fri Jan 6 13:08:36 2006 From: bandit1921 at cox.net (Joe Smith) Date: Fri, 6 Jan 2006 14:08:36 -0500 Subject: [sebhc] Siemens Drive Terminator Message-ID: <20060106191214.MVI15695.fed1rmmtao01.cox.net@[172.18.180.8]> Even Radio Shack might have some of those..They used to anyway.. > > From: davidwallace2000 at comcast.net > Date: 2006/01/06 Fri PM 01:23:23 EST > To: sebhc at sebhc.org, > CC: "Barry Watzman" > Subject: Re: [sebhc] Siemens Drive Terminator > > According to my documentation, it was 132 ohms. 120 would probably work fine. > > -------------- Original message -------------- > From: "Barry Watzman" > > > > > I either need a terminator, a source for a terminator, or a terminator > > description sufficient to allow me to make my own terminator from discreet > > parts for one of the Wangco / Siemens drives used in the H-17 and the H-89 > > (the earlier, single-sided drives with the "full face" door). > > > > Does anyone have this information? > > > > Barry Watzman > > Watzman at neo.rr.com > > > > > > > > -- > > Delivered by the SEBHC Mailing List > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List From ddl-cctech at danlan.com Fri Jan 6 13:51:43 2006 From: ddl-cctech at danlan.com (Dan Lanciani) Date: Fri, 6 Jan 2006 14:51:43 -0500 (EST) Subject: [sebhc] Siemens Drive Terminator Message-ID: <200601061951.OAA18523@ss10.danlan.com> |I either need a terminator, a source for a terminator, or a terminator |description sufficient to allow me to make my own terminator from discreet |parts for one of the Wangco / Siemens drives used in the H-17 and the H-89 |(the earlier, single-sided drives with the "full face" door). | |Does anyone have this information? These networks typically consisted of 12 pairs of 220/330 ohm terminators wired to pins 1-6 and 8-13 with pin 14 the common for the 220 ohm pull up and pin 7 the common for the 330 ohm pull down (i.e., same power supply pins as many 74xxx parts). They are standard parts, but I'm sure I have a few if you can't find them. Dan Lanciani ddl at danlan.*com -- Delivered by the SEBHC Mailing List From ddl-cctech at danlan.com Fri Jan 6 13:56:13 2006 From: ddl-cctech at danlan.com (Dan Lanciani) Date: Fri, 6 Jan 2006 14:56:13 -0500 (EST) Subject: [sebhc] Re: Unix for H-8/H-89 ? Message-ID: <200601061956.OAA18608@ss10.danlan.com> |At ZDS I had worked on putting Unix v6 on the Z100 (but never finished). |What got me excited about doing it was the protected mode of the 286 chip, |and it's support for virtual memory (and a larger memory capacity overall). I wrote a fairly comprehensive unix kernel clone for the Z100 (most of the 4BSD API less the networking). Later I ported it to the IBM PC and later still to the protected mode of the 286 on the AT. I even wrote a DOS emulator that was good enough to run the Microsoft C compiler so I could host a compile of the operating system under itself. (Unfortunately, the emulator didn't support the 286 version of the OS. :(). It was called OS/88 and might still be floating around, or I could dig up a copy... Dan Lanciani ddl at danlan.*com -- Delivered by the SEBHC Mailing List From dave04a at dunfield.com Fri Jan 6 10:00:35 2006 From: dave04a at dunfield.com (Dave Dunfield) Date: Fri, 6 Jan 2006 16:00:35 +0000 Subject: [sebhc] Siemens Drive Terminator In-Reply-To: <009501c612f3$291dce90$6601a8c0@barry> References: <20060106180539.NLTL20441.fed1rmmtao10.cox.net@[172.18.180.8]> Message-ID: <20060106200727.LELL17838.orval.sprint.ca@dunfield.com> > But what is the configuration .... how many pins, which pin(s) are common > .... there were different configurations of resistor terminator packs. > Anyone have a schematic of the drive? Or want to take an Ohmmeter to a > pack? I do know that the terminators were a stock part, and if I have the > right information, I can buy one (but it might be a 25 cent part with a $25 > minimum order and a $7 minimum shipping cost). > > I either need a terminator, a source for a terminator, or a terminator > > description sufficient to allow me to make my own terminator from discreet > > parts for one of the Wangco / Siemens drives used in the H-17 and the H-89 > > (the earlier, single-sided drives with the "full face" door). I'm assuming that this must be "odd" ... could it perhaps be the same as the terminator used on the 8" Siemens drives: >From the FDD-100-8 manual, the terminator is described as: "A dual-inline IC package containing a terminating resistor network for all input interface lines. For each input line there is a 220-Ohm resistor to +5 volts, and a 330-Ohm resistor to ground". Pulled one of the spare drives, and took a look at the terminator installed in it - it is labled "16-3-221-331" which would seem to bear this out. The pack is a 16-pin DIP. The manual does not give a pinout, however from what I can measure, it appears that pin 8 is ground, pin 16 is +5, and pins 1-7 and 9-15 are the input connections. (Resistance from pin 16 to pin 7 is 39 ohms which is exactly right for 14 550 Ohm sets in parallel - All other pins read about 138 Ohms to pin 14, and about 146 Ohms to pin 8 - I haven't worked out what it should be for the complete network, but I suspect this is about right. So, if either this is the drive, or your drive uses the same termination, this should be all you need. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html -- Delivered by the SEBHC Mailing List From Watzman at neo.rr.com Fri Jan 6 14:18:24 2006 From: Watzman at neo.rr.com (Barry Watzman) Date: Fri, 6 Jan 2006 15:18:24 -0500 Subject: [sebhc] Re: Unix for H-8/H-89 ? In-Reply-To: <200601061956.OAA18608@ss10.danlan.com> Message-ID: <00a501c612fe$58f87970$6601a8c0@barry> I need more information than just a value. Some of these terminator packs were just packs of resistors from one side of the dip package to the other, but some were networks of multiple resistors of different values, and some had internal "common" ties to ground or +5 volts. I need a schematic of the terminator, or a part number. Take a look here, at the figures on the right-hand side of the page: http://dkc3.digikey.com/PDF/T061/1256.pdf Is it figure 4 or figure 5 or figure 6 (note that figures 4 and 6 have multiple resistors of different values inside the terminator pack, and figure 4 was often used for bus termination). Plus, of course, there is the question of the value(s) of the resistors in the pack. Barry Watzman Watzman at neo.rr.com -- Delivered by the SEBHC Mailing List From ddl-cctech at danlan.com Fri Jan 6 15:36:21 2006 From: ddl-cctech at danlan.com (Dan Lanciani) Date: Fri, 6 Jan 2006 16:36:21 -0500 (EST) Subject: [sebhc] H89s, h19s, Z100 available Message-ID: <200601062136.QAA19518@ss10.danlan.com> |From: | |Dan, |I am interested in an H19 and an H89. I am in in Hartford and could be there at your convenience. |Jack Ok, Jack now has all the equipment. It turns out that I had forgotten that I had upgraded one of the H89s with an H37 soft sector controller and associated power supply and monitor enhancements. I also had the full soft sector controller manual with schematics. I think there were some complaints that the copy in the archive was incomplete, so whoever is interested might want to prevail upon Jack to get it scanned... Dan Lanciani ddl at danlan.*com -- Delivered by the SEBHC Mailing List From Watzman at neo.rr.com Fri Jan 6 19:05:23 2006 From: Watzman at neo.rr.com (Barry Watzman) Date: Fri, 6 Jan 2006 20:05:23 -0500 Subject: [sebhc] Siemens Drive Terminator In-Reply-To: <010620062300.20399.43BEF699000162DF00004FAF2205884484CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> Message-ID: <003e01c61326$705017e0$6601a8c0@barry> That helps a lot ... it would be nice to confirm the pinout, but the fact that it's 220/330 ohms, plus being a 16-pin part, probably nails it down. I was trying to find the p/n on the digikey page that I referenced, and they definitely have it (I think it's figure 6), but I can't tell how to specify the p/n from the information on that page. Barry Watzman Watzman at neo.rr.com _____ From: davidwallace2000 at comcast.net [mailto:davidwallace2000 at comcast.net] Sent: Friday, January 06, 2006 6:01 PM To: Barry Watzman Subject: RE: [sebhc] Siemens Drive Terminator This info is from the schematic for the Wangco/Perkin-Elmer model 82 drive manual that came with my WH-17. "Typical termination when part # 618417-001 installed in location 1E" and shows a network consisting of 220 ohms to + and 330 ohms to ground, with the signal connected to the center of this voltage divider. (By Thevenin's theorem, this is 132 ohms to 3.5 V.) Paragraph 2.3.5 of the manual (page 2-6) says the same thing. Nowhere is the pin-out for the terminator given, and my WH17 is not currently accessible enough to allow me to investigate further. My assumption is that in 8 will be ground, pin 16 will be +5V and the remaining 14 pins will be connected to the signals (or possibly not all networks will be used -- there seem to be only 12 signal lines on J1). Hope this helps. Location 1E on the drive is a 16-pin socket. -------------- Original message -------------- From: "Barry Watzman" I need more information than just a value. Some of these were just packs of resistors from one side of the dip package to the other, but some were complex networks of multiple resistors of different values, and some had internal "common" ties to ground or +5 volts. I need a schematic of the terminator, or a part number. Take a look here, at the figures on the right-hand side of the page: http://dkc3.digikey.com/PDF/T061/1256.pdf Is it figure 4 or figure 5 or figure 6 (note that figures 4 and 6 have multiple resistors of different values inside the terminator pack, and figure 4 was often used for bus termination). Plus, of course, there is the question of the value(s) of the resistors in the pack. Barry Watzman Watzman at neo.rr.com -- Delivered by the SEBHC Mailing List From bandit1921 at cox.net Fri Jan 6 19:17:18 2006 From: bandit1921 at cox.net (Joe Smith) Date: Fri, 6 Jan 2006 20:17:18 -0500 Subject: [sebhc] Siemens Drive Terminator Message-ID: <20060107011920.XTJM20050.fed1rmmtao06.cox.net@[172.18.180.8]> Look here: http://www.jameco.com for resitor network > > From: "Barry Watzman" > Date: 2006/01/06 Fri PM 08:05:23 EST > To: , > Subject: RE: [sebhc] Siemens Drive Terminator > > That helps a lot ... it would be nice to confirm the pinout, but the fact > that it's 220/330 ohms, plus being a 16-pin part, probably nails it down. I > was trying to find the p/n on the digikey page that I referenced, and they > definitely have it (I think it's figure 6), but I can't tell how to specify > the p/n from the information on that page. > > > > Barry Watzman > > Watzman at neo.rr.com > > > > > > _____ > > From: davidwallace2000 at comcast.net [mailto:davidwallace2000 at comcast.net] > Sent: Friday, January 06, 2006 6:01 PM > To: Barry Watzman > Subject: RE: [sebhc] Siemens Drive Terminator > > > > This info is from the schematic for the Wangco/Perkin-Elmer model 82 drive > manual that came with my WH-17. > > > > "Typical termination when part # 618417-001 installed in location 1E" and > shows a network consisting of 220 ohms to + and 330 ohms to ground, with the > signal connected to the center of this voltage divider. (By Thevenin's > theorem, this is 132 ohms to 3.5 V.) > > > > Paragraph 2.3.5 of the manual (page 2-6) says the same thing. > > > > Nowhere is the pin-out for the terminator given, and my WH17 is not > currently accessible enough to allow me to investigate further. My > assumption is that in 8 will be ground, pin 16 will be +5V and the remaining > 14 pins will be connected to the signals (or possibly not all networks will > be used -- there seem to be only 12 signal lines on J1). > > > > Hope this helps. > > > > Location 1E on the drive is a 16-pin socket. > > > > -------------- Original message -------------- > From: "Barry Watzman" > > I need more information than just a value. Some of these were just packs of > resistors from one side of the dip package to the other, but some were > complex networks of multiple resistors of different values, and some had > internal "common" ties to ground or +5 volts. I need a schematic of the > terminator, or a part number. > > > > Take a look here, at the figures on the right-hand side of the page: > > > > http://dkc3.digikey.com/PDF/T061/1256.pdf > > > > Is it figure 4 or figure 5 or figure 6 (note that figures 4 and 6 have > multiple resistors of different values inside the terminator pack, and > figure 4 was often used for bus termination). Plus, of course, there is the > question of the value(s) of the resistors in the pack. > > > > Barry Watzman > > Watzman at neo.rr.com > > > > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List From Watzman at neo.rr.com Fri Jan 6 23:15:56 2006 From: Watzman at neo.rr.com (Barry Watzman) Date: Sat, 7 Jan 2006 00:15:56 -0500 Subject: [sebhc] Siemens Drive Terminator In-Reply-To: <20060107011920.XTJM20050.fed1rmmtao06.cox.net@[172.18.180.8]> Message-ID: <002c01c61349$708a25c0$6601a8c0@barry> They don't have it. They have 200 resistor networks, this isn't one of them. -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Joe Smith Sent: Friday, January 06, 2006 8:17 PM To: sebhc at sebhc.org Subject: Re: RE: [sebhc] Siemens Drive Terminator Look here: http://www.jameco.com for resistor network > > From: "Barry Watzman" > Date: 2006/01/06 Fri PM 08:05:23 EST > To: , > Subject: RE: [sebhc] Siemens Drive Terminator > > That helps a lot ... it would be nice to confirm the pinout, but the fact > that it's 220/330 ohms, plus being a 16-pin part, probably nails it down. I > was trying to find the p/n on the digikey page that I referenced, and they > definitely have it (I think it's figure 6), but I can't tell how to specify > the p/n from the information on that page. > > Barry Watzman > > Watzman at neo.rr.com > _____ > > From: davidwallace2000 at comcast.net [mailto:davidwallace2000 at comcast.net] > Sent: Friday, January 06, 2006 6:01 PM > To: Barry Watzman > Subject: RE: [sebhc] Siemens Drive Terminator > > This info is from the schematic for the Wangco/Perkin-Elmer model 82 drive > manual that came with my WH-17. > > "Typical termination when part # 618417-001 installed in location 1E" and > shows a network consisting of 220 ohms to + and 330 ohms to ground, with the > signal connected to the center of this voltage divider. (By Thevenin's > theorem, this is 132 ohms to 3.5 V.) > > Paragraph 2.3.5 of the manual (page 2-6) says the same thing. > > Nowhere is the pin-out for the terminator given, and my WH17 is not > currently accessible enough to allow me to investigate further. My > assumption is that in 8 will be ground, pin 16 will be +5V and the remaining > 14 pins will be connected to the signals (or possibly not all networks will > be used -- there seem to be only 12 signal lines on J1). > > Hope this helps. > > Location 1E on the drive is a 16-pin socket. > > -------------- Original message -------------- > From: "Barry Watzman" > > I need more information than just a value. Some of these were just packs of > resistors from one side of the dip package to the other, but some were > complex networks of multiple resistors of different values, and some had > internal "common" ties to ground or +5 volts. I need a schematic of the > terminator, or a part number. > > Take a look here, at the figures on the right-hand side of the page: > > http://dkc3.digikey.com/PDF/T061/1256.pdf > > Is it figure 4 or figure 5 or figure 6 (note that figures 4 and 6 have > multiple resistors of different values inside the terminator pack, and > figure 4 was often used for bus termination). Plus, of course, there is the > question of the value(s) of the resistors in the pack. > > Barry Watzman > > Watzman at neo.rr.com > > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From ddl-cctech at danlan.com Sat Jan 7 01:30:10 2006 From: ddl-cctech at danlan.com (Dan Lanciani) Date: Sat, 7 Jan 2006 02:30:10 -0500 (EST) Subject: [sebhc] Siemens Drive Terminator Message-ID: <200601070730.CAA23708@ss10.danlan.com> |I was trying to find the p/n on the digikey page that I referenced, and they |definitely have it (I think it's figure 6), but I can't tell how to specify |the p/n from the information on that page. I'm not sure why this is causing so much trouble... The DigiKey part number would be 760-5-r220/330, but they appear to be out of stock. The Bourns part number is 4114R-3-221/331. Newark has them in stock. Their part number is 13F9601. Dan Lanciani ddl at danlan.*com -- Delivered by the SEBHC Mailing List From leeahart at earthlink.net Sat Jan 7 13:14:52 2006 From: leeahart at earthlink.net (Lee Hart) Date: Sat, 7 Jan 2006 14:14:52 -0500 (EST) Subject: [sebhc] Siemens Drive Terminator Message-ID: <26606979.1136661292836.JavaMail.root@elwamui-cypress.atl.sa.earthlink.net> From: Barry Watzman >They don't have it. They have 200 resistor networks, this isn't one of them. Don't sweat it,Barry.I have planty; I'll just mail you one for free. It's out of a Siemens FDD 100-5 drive, so I'm sure it's the right one. For the record, it is a 14-pin DIP (not 16-pin). VCC to pin 14, GND to pin 7, just like any TTL IC. Each of the other 12 pins has a 220 ohm resistor to VCC and a 330 ohm resistor to GND. Part number is Allen-Bradley314E221331. This type of teminator draws less 5v power and creates less RFI, but still terminates the buss properly. PS: The Wordstar manuals arrived back, safe and sound. Thanks! -- Lee Hart -- Delivered by the SEBHC Mailing List From Watzman at neo.rr.com Sat Jan 7 20:39:07 2006 From: Watzman at neo.rr.com (Barry Watzman) Date: Sat, 7 Jan 2006 21:39:07 -0500 Subject: [sebhc] Siemens Drive Terminator In-Reply-To: <26606979.1136661292836.JavaMail.root@elwamui-cypress.atl.sa.earthlink.net> Message-ID: <001601c613fc$b28bf1c0$6601a8c0@barry> Thanks; next time I order anything, I'll get several, but I can's justify an order for just one of these. Barry -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Lee Hart Sent: Saturday, January 07, 2006 2:15 PM To: sebhc at sebhc.org Subject: RE: RE: [sebhc] Siemens Drive Terminator From: Barry Watzman >They don't have it. They have 200 resistor networks, this isn't one of them. Don't sweat it,Barry.I have planty; I'll just mail you one for free. It's out of a Siemens FDD 100-5 drive, so I'm sure it's the right one. For the record, it is a 14-pin DIP (not 16-pin). VCC to pin 14, GND to pin 7, just like any TTL IC. Each of the other 12 pins has a 220 ohm resistor to VCC and a 330 ohm resistor to GND. Part number is Allen-Bradley314E221331. This type of teminator draws less 5v power and creates less RFI, but still terminates the buss properly. PS: The Wordstar manuals arrived back, safe and sound. Thanks! -- Lee Hart -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From leeahart at earthlink.net Sun Jan 8 18:46:35 2006 From: leeahart at earthlink.net (Lee Hart) Date: Sun, 8 Jan 2006 19:46:35 -0500 Subject: [sebhc] Siemens Drive Terminator In-Reply-To: <003e01c61326$705017e0$6601a8c0@barry> References: <003e01c61326$705017e0$6601a8c0@barry> Message-ID: <200601081946.35999.leeahart@earthlink.net> Barry Watzman wrote: > That helps a lot ... it would be nice to confirm the pinout, but the fact > that it's 220/330 ohms, plus being a 16-pin part, probably nails it down. > I was trying to find the p/n on the digikey page that I referenced, and > they definitely have it (I think it's figure 6), but I can't tell how to > specify the p/n from the information on that page. No, it's 14 pin. Pin 14 is VCC, pin 7 is GND; all other pins have 220 ohms to VCC and 330 ohms to ground. A terminator is in the mail to you, Barry. -- Lee A. Hart 814 8th Ave N Sartell MN 56377 leeahart at earthlink.net -- Delivered by the SEBHC Mailing List From jmacgraith at cox.net Sun Jan 8 21:03:15 2006 From: jmacgraith at cox.net (jmacgraith at cox.net) Date: Sun, 8 Jan 2006 22:03:15 -0500 Subject: [sebhc] H89s, h19s, Z100 available Message-ID: <20060109030036.MCAE29285.eastrmmtao03.cox.net@[172.18.52.8]> Hi Robin, I am the new owner of the H89 tape I/O board. I might need it for some bootstrapping, then I can send it to you. Give me a couple of months and then give me a shout. Jack > > From: "Robin England" > Date: 2005/12/20 Tue AM 04:28:44 EST > To: > Subject: Re: [sebhc] H89s, h19s, Z100 available > > Hi Dan > > I'd really like the H89 tape I/O board if you can find it and would be happy > to pay you something for it. > > If you would consider shipping to the UK, please tell me how much it would > cost. I am in Oxfordshire, United Kingdom and my post code is OX26 6HR. > > Thank you > Robin England > > ----- Original Message ----- > From: "Dan Lanciani" > To: > Sent: Monday, December 19, 2005 5:51 AM > Subject: [sebhc] H89s, h19s, Z100 available > > > > I have two H89s, two H19s, and a Z100 (all in one model) available. Both > > H89s have the internal floppy drive. One has an H47 interface and the > other > > a connector for more H17 disks. I believe I have a tape i/o board for one > > H89 as well. They are located in Gloucester, MA. Shipping may be > possible, > > but they are pretty heavy and I don't have appropriate boxes. Price is > $0. > > > > Dan Lanciani > > ddl at danlan.*com > > -- > > Delivered by the SEBHC Mailing List > > -- > Delivered by the SEBHC Mailing List > -- Delivered by the SEBHC Mailing List From robin.england at dial.pipex.com Mon Jan 9 03:28:25 2006 From: robin.england at dial.pipex.com (Robin England) Date: Mon, 9 Jan 2006 09:28:25 -0000 Subject: [sebhc] H89s, h19s, Z100 available References: <20060109030036.MCAE29285.eastrmmtao03.cox.net@[172.18.52.8]> Message-ID: <009501c614ff$0b6c49e0$03fea8c0@mpxp731gb> Hi Jack Thank you for your offer, yes I'll give you a shout a bit later this year then. Regards Robin ----- Original Message ----- From: To: Sent: Monday, January 09, 2006 3:03 AM Subject: Re: Re: [sebhc] H89s, h19s, Z100 available > Hi Robin, > I am the new owner of the H89 tape I/O board. I might need it for some bootstrapping, then I can send it to you. Give me a couple of months and then give me a shout. > Jack > > > > > From: "Robin England" > > Date: 2005/12/20 Tue AM 04:28:44 EST > > To: > > Subject: Re: [sebhc] H89s, h19s, Z100 available > > > > Hi Dan > > > > I'd really like the H89 tape I/O board if you can find it and would be happy > > to pay you something for it. > > > > If you would consider shipping to the UK, please tell me how much it would > > cost. I am in Oxfordshire, United Kingdom and my post code is OX26 6HR. > > > > Thank you > > Robin England > > > > ----- Original Message ----- > > From: "Dan Lanciani" > > To: > > Sent: Monday, December 19, 2005 5:51 AM > > Subject: [sebhc] H89s, h19s, Z100 available > > > > > > > I have two H89s, two H19s, and a Z100 (all in one model) available. Both > > > H89s have the internal floppy drive. One has an H47 interface and the > > other > > > a connector for more H17 disks. I believe I have a tape i/o board for one > > > H89 as well. They are located in Gloucester, MA. Shipping may be > > possible, > > > but they are pretty heavy and I don't have appropriate boxes. Price is > > $0. > > > > > > Dan Lanciani > > > ddl at danlan.*com > > > -- > > > Delivered by the SEBHC Mailing List > > > > -- > > Delivered by the SEBHC Mailing List > > > > -- > Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From robin.england at dial.pipex.com Wed Jan 18 10:32:57 2006 From: robin.england at dial.pipex.com (Robin England) Date: Wed, 18 Jan 2006 16:32:57 -0000 Subject: [sebhc] H89 strange problems.... Message-ID: <00d401c61c4c$d738bd70$027ba8c0@HOME01> Hello All Firstly many thanks for your response to my previous request for MTR ROMs for the H/Z89 machines. I have now been able to get both the machines I have booting to HDOS ok. I do, however, have a really strange problem with both of them though and I was wondering if anyone has any ideas, or previous experience of this. After a short while of being powered up (a few minutes usually), a horizontal bar starts to move slowly from the bottom of the screen to the top. When the bar reaches the top, another one starts from the bottom. At first I thought that this was due to ripple on the CRT electronics 85v supply (suspected leaky capacitor). However, a quick check with the 'scope proved otherwise and even replacement of the cap with a brand new one makes no difference. The really weird thing about these bars, is that the characters on the screen directly under the moving bar become faint and even appear to flicker and break up at pixel level. At the same time, the main logic board sometimes goes crazy; often it locks up, crashes or you can hear the floppy drive start clicking. Even stranger, is that if the main logic board is removed and the terminal board is used alone, the problem does not occur at all - you can fill the screen with characters and they all remain bright and stable. I have also been able to make the problem go away even when using the main logic (CPU) board provided that the 5v supply that powers it is obtained from a separate switch-mode PSU. All this would suggest to most people that there is a definite problem with the 5v supply to the main CPU board, however I can see no problems with the 'scope. I've even replaced all the capacitors on the separate PSU PCB plus I've even replaced the 5v and 12v regulators (TO3 package) that supply both the CPU board and terminal board, but no difference. The machines have both been in storage since the early 1990s and were working fine back then. One is a Z89 (factory built) and the other is a home built H89, one has a paper-white CRT and the other a green CRT. Both machines have a hard-sectored floppy drive built-in. Is this a known problem? Does anyone have any suggestions of other things I could try to resolve it? Thanks & regards, Robin -- Delivered by the SEBHC Mailing List From paulpenn at knology.net Wed Jan 18 10:56:01 2006 From: paulpenn at knology.net (Paul A. Pennington) Date: Wed, 18 Jan 2006 11:56:01 -0500 Subject: [sebhc] H89 strange problems.... References: <00d401c61c4c$d738bd70$027ba8c0@HOME01> Message-ID: <005f01c61c50$0fbaf570$6401a8c0@A31PAUL> Robin; Those are hum bars in your video, and your troubleshooting is in the right area -- the power supply. One weak point in these units is the bridge rectifier. It's the large one in a metal case with four push-on terminals. Replace it with one rated for higher current. While you're at it, replace the connectors with soldered connections to both ends of the wiring to the bridge. The molex connector would frequently fail from overheating due to the current it carried. Soldering the wires to the bridge and the circuit board will remove this as a future problem. After fixing many of these back in the day, I sent it in to Heath/Zenith and they published it as a service note. Paul Pennington Augusta, Georgia -- Delivered by the SEBHC Mailing List From bandit1921 at cox.net Wed Jan 18 11:37:07 2006 From: bandit1921 at cox.net (Joe Smith) Date: Wed, 18 Jan 2006 10:37:07 -0700 Subject: [sebhc] H89 strange problems.... In-Reply-To: <005f01c61c50$0fbaf570$6401a8c0@A31PAUL> References: <00d401c61c4c$d738bd70$027ba8c0@HOME01> <005f01c61c50$0fbaf570$6401a8c0@A31PAUL> Message-ID: <6.2.5.6.2.20060118103229.020b8c20@cox.net> I used the big rectifier that Radio Shack used to carry..Part NUmber is: 276-1185 At 11:56 AM 1/18/2006 -0500, you wrote: > Robin; > > Those are hum bars in your video, and your troubleshooting is in > the right area -- the power supply. One weak point in these units > is the bridge rectifier. It's the large one in a metal case with > four push-on terminals. Replace it with one rated for higher current. > > While you're at it, replace the connectors with soldered > connections to both ends of the wiring to the bridge. The molex > connector would frequently fail from overheating due to the current > it carried. Soldering the wires to the bridge and the circuit > board will remove this as a future problem. > > After fixing many of these back in the day, I sent it in to > Heath/Zenith and they published it as a service note. > > Paul Pennington > Augusta, Georgia >-- >Delivered by the SEBHC Mailing List Joe Smith joebandit jtsdadinaz Conbuilder debugger /Programmer -- Delivered by the SEBHC Mailing List From robin.england at dial.pipex.com Wed Jan 18 14:01:20 2006 From: robin.england at dial.pipex.com (Robin England) Date: Wed, 18 Jan 2006 20:01:20 -0000 Subject: [sebhc] H89 strange problems.... References: <00d401c61c4c$d738bd70$027ba8c0@HOME01> <005f01c61c50$0fbaf570$6401a8c0@A31PAUL> <6.2.5.6.2.20060118103229.020b8c20@cox.net> Message-ID: <004f01c61c69$f4012f60$027ba8c0@HOME01> Thanks guys! I was beginning to think I was going crazy! I'll replace the bridge rectifier and solder the connections directly, will let you know the results! ----- Original Message ----- From: "Joe Smith" To: Sent: Wednesday, January 18, 2006 5:37 PM Subject: Re: [sebhc] H89 strange problems.... > I used the big rectifier that Radio Shack used to carry..Part NUmber > is: 276-1185 > > At 11:56 AM 1/18/2006 -0500, you wrote: > > Robin; > > > > Those are hum bars in your video, and your troubleshooting is in > > the right area -- the power supply. One weak point in these units > > is the bridge rectifier. It's the large one in a metal case with > > four push-on terminals. Replace it with one rated for higher current. > > > > While you're at it, replace the connectors with soldered > > connections to both ends of the wiring to the bridge. The molex > > connector would frequently fail from overheating due to the current > > it carried. Soldering the wires to the bridge and the circuit > > board will remove this as a future problem. > > > > After fixing many of these back in the day, I sent it in to > > Heath/Zenith and they published it as a service note. > > > > Paul Pennington > > Augusta, Georgia > >-- > >Delivered by the SEBHC Mailing List > > Joe Smith > joebandit > jtsdadinaz > Conbuilder debugger /Programmer > > -- > Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From davidwallace2000 at comcast.net Wed Jan 18 14:22:00 2006 From: davidwallace2000 at comcast.net (davidwallace2000 at comcast.net) Date: Wed, 18 Jan 2006 20:22:00 +0000 Subject: [sebhc] H89 strange problems.... Message-ID: <011820062022.18011.43CEA3680000AEBF0000465B2200735446CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> An embedded and charset-unspecified text was scrubbed... Name: not available URL: From davidwallace2000 at comcast.net Wed Jan 18 14:21:59 2006 From: davidwallace2000 at comcast.net (davidwallace2000 at comcast.net) Date: Wed, 18 Jan 2006 20:21:59 +0000 Subject: [sebhc] H89 strange problems.... Message-ID: <011820062021.17974.43CEA3670002B75C000046362200735446CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> An embedded and charset-unspecified text was scrubbed... Name: not available URL: From davidwallace2000 at comcast.net Wed Jan 18 14:27:44 2006 From: davidwallace2000 at comcast.net (davidwallace2000 at comcast.net) Date: Wed, 18 Jan 2006 20:27:44 +0000 Subject: [sebhc] H89 strange problems.... Message-ID: <011820062027.29836.43CEA4C00000800C0000748C2200735446CFCFCFCD0A0C0E04040E990B07900E0B@comcast.net> An embedded and charset-unspecified text was scrubbed... Name: not available URL: From dwight.elvey at amd.com Wed Jan 18 15:10:40 2006 From: dwight.elvey at amd.com (Dwight Elvey) Date: Wed, 18 Jan 2006 13:10:40 -0800 (PST) Subject: [sebhc] H89 strange problems.... Message-ID: <200601182110.NAA06047@ca2h0430.amd.com> Hi If the rectifiers don't fix it, try a different version of HDOS or at least a different boot disk. The fact that the drive is also acting up is real suspicious. Also, that both units are having the same problems. I'm thinking that there may be an issue with the drive head load. If it is being turned on and off rapedly it might cause funny things to happen the fact that the video is doing funny things sounds like some form of ground coupling. You might check with your scope, the logic ground at several places relative to the filter cap on the power supply( including the video circuits ). Don't forget to look at the 12v lines as well. Just some more thoughts Dwight >From: davidwallace2000 at comcast.net > >A couple of other possibilities (remote ones, but...) > >1. Magnetic fields from some piece of equipment nearby > >2. > >-------------- Original message -------------- >From: "Robin England" > >> Thanks guys! I was beginning to think I was going crazy! I'll replace the >> bridge rectifier and solder the connections directly, will let you know the >> results! >> >> >> ----- Original Message ----- >> From: "Joe Smith" >> To: >> Sent: Wednesday, January 18, 2006 5:37 PM >> Subject: Re: [sebhc] H89 strange problems.... >> >> >> > I used the big rectifier that Radio Shack used to carry..Part NUmber >> > is: 276-1185 >> > >> > At 11:56 AM 1/18/2006 -0500, you wrote: >> > > Robin; >> > > >> > > Those are hum bars in your video, and your troubleshooting is in >> > > the right area -- the power supply. One weak point in these units >> > > is the bridge rectifier. It's the large one in a metal case with >> > > four push-on terminals. Replace it with one rated for higher current. >> > > >> > > While you're at it, replace the connectors with soldered >> > > connections to both ends of the wiring to the bridge. The molex >> > > connector would frequently fail from overheating due to the current >> > > it carried. Soldering the wires to the bridge and the circuit >> > > board will remove this as a future problem. >> > > >> > > After fixing many of these back in the day, I sent it in to >> > > Heath/Zenith and they published it as a service note. >> > > >> > > Paul Pennington >> > > Augusta, Georgia >> > >-- >> > >Delivered by the SEBHC Mailing List >> > >> > Joe Smith >> > joebandit >> > jtsdadinaz >> > Conbuilder debugger /Programmer >> > >> > -- >> > Delivered by the SEBHC Mailing List >> >> -- >> Delivered by the SEBHC Mailing List >-- >Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From leeahart at earthlink.net Wed Jan 18 22:17:39 2006 From: leeahart at earthlink.net (Lee Hart) Date: Wed, 18 Jan 2006 23:17:39 -0500 Subject: [sebhc] H89 strange problems.... In-Reply-To: <005f01c61c50$0fbaf570$6401a8c0@A31PAUL> References: <00d401c61c4c$d738bd70$027ba8c0@HOME01> <005f01c61c50$0fbaf570$6401a8c0@A31PAUL> Message-ID: <200601182317.40035.leeahart@earthlink.net> Paul A. Pennington wrote: > Robin; > > Those are hum bars in your video, and your troubleshooting is in the > right area -- the power supply. One weak point in these units is the > bridge rectifier. It's the large one in a metal case with four push-on > terminals. Replace it with one rated for higher current. > > While you're at it, replace the connectors with soldered connections to > both ends of the wiring to the bridge. The molex connector would > frequently fail from overheating due to the current it carried. Soldering > the wires to the bridge and the circuit board will remove this as a future > problem. Very close! Robin, open the case and look at P101, the white 8-pin connector at the rearmost edge of the little power supply board, directly under the fan. You will see two yellow wires. I'll bet you this connector is getting hot and discolored around those yellow wires. The connection is going bad, adding resistance and voltage drop, so the 5v regulator is not working properly. The (Heath approved) fix is to cut the two yellow wires going to P101, and connect them directly to the AC input terminals of the bridge rectifier. This takes 4 connectors out of the path from transformer to bridge, greatly reducing heating and voltage drops (and incidentally eliminating your hum bars). -- Lee A. Hart 814 8th Ave N Sartell MN 56377 leeahart at earthlink.net -- Delivered by the SEBHC Mailing List From dwight.elvey at amd.com Thu Jan 19 13:30:42 2006 From: dwight.elvey at amd.com (Dwight Elvey) Date: Thu, 19 Jan 2006 11:30:42 -0800 (PST) Subject: [sebhc] H89 strange problems.... Message-ID: <200601191930.LAA05844@ca2h0430.amd.com> >From: "Lee Hart" ---snip--- >Very close! Robin, open the case and look at P101, the white 8-pin connector >at the rearmost edge of the little power supply board, directly under the >fan. You will see two yellow wires. I'll bet you this connector is getting >hot and discolored around those yellow wires. The connection is going bad, >adding resistance and voltage drop, so the 5v regulator is not working >properly. > ---snip--- Hi If the connectors haven't degraded too much, there is another solution that I've been using for years on high current connectors. I put silicon grease on the pins. ( note: This is NOT heat sink grease ). Several of the products I've used are DC#4 ( DowCorning ), Silglyde ( from automotive shop ), and A grease sold by Napa automotive shops. Every time I've suggested this, many seem to come up with all kinds of reasons not to use it. In most cases, they are wrong but what can I say. While at Intel we did studies of this, including and environmental test. It came through with flying colors except for one problem. If any of the grease got on components that were to be later marked, the stamped marks would not stay on the parts. Electrically, it works wonders. As an example, on edge connectors, we typically saw a 10 to 15 milliohms on a gold to gold contact. You say, not to bad. But when we added the grease to the connectors, it dropped to around 1 to 2 milliohms ( the limits of our measuring tools ). Things that others have stated as objections: 1. When it gets hot it will run on other electrical parts and cause problems. Answer: First it is electrically in active and it is one of the few substances that get thicker with temperature. 2. It well get into switches and cause failures. Answer: I actually put it in switches to improve there operation, both low current and high current. In high current, it helps to eliminate arcing. In low current, it reduces the need to have scrubbing to remove oxides and reduces resistance. 3. It is messy to use. Answer: Yes, but it does work. Places that I've seen it not work well: 1. very high impedance analog circuits. This is in electrometers and I only saw issues with the automotive products and not with DC#4. These problems only showed with resistances in the order of 10^9 ohms and greater. I suspect that is a difference in the purity of the products. I've not seen any issues over time using the other greases in logic and other circuits. 2. Places that are exposed to strong salt air. In these case, we are talking about boat applications. There are a few other products that are listed for this application. Still, talking to a fellow that works with undersea measurement systems, they use DC#4 in things like BNC connectors to keep the water from entering the connectors from pressure. Places it does work well: 1. Battery connectors 2. The RAM packs connected to the back of the ZX81's. Anyone that has played with the expanded RAM modules on the Sinclair's knows what this is about. After applying grease, one could bounce the computer w/ RAM on the table without losing any data in the RAM ( a remarkable demonstration ). 3. Various EPROM sockets. Although replacing them with machine pin sockets is best, the grease will often get things working. It won't solve broken internal pins of the socket, as often happens because of the way the pins were manufactured. 4. High current connectors. This includes most any micro processor connectors as well as some truly high current applications. By high current, I mean 500 to 1000 amps. 5. Slide switches that have suffered some from water based fluxes. 6. TV turret tuner contacts. 7. High current switches that suffer from arcing. Dwight -- Delivered by the SEBHC Mailing List From tw at timothyweber.org Thu Jan 19 14:37:23 2006 From: tw at timothyweber.org (Timothy Weber) Date: Thu, 19 Jan 2006 15:37:23 -0500 Subject: [sebhc] H89 strange problems.... In-Reply-To: <200601191930.LAA05844@ca2h0430.amd.com> References: <200601191930.LAA05844@ca2h0430.amd.com> Message-ID: <43CFF883.4010500@timothyweber.org> Dwight Elvey wrote: > > I put silicon grease on the pins. Fascinating. Thanks for this. -- Timothy J. Weber http://timothyweber.org -- Delivered by the SEBHC Mailing List From dwight.elvey at amd.com Thu Jan 19 15:42:49 2006 From: dwight.elvey at amd.com (Dwight Elvey) Date: Thu, 19 Jan 2006 13:42:49 -0800 (PST) Subject: [sebhc] H89 strange problems.... Message-ID: <200601192142.NAA09687@ca2h0430.amd.com> Hi I thought I'd mention that DC#4 is available at many electrical supply shops and McMaster-Carr on the web. Dwight >From: "Timothy Weber" > >Dwight Elvey wrote: > > > > I put silicon grease on the pins. > >Fascinating. Thanks for this. >-- >Timothy J. Weber >http://timothyweber.org >-- >Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From leeahart at earthlink.net Sat Jan 21 16:57:58 2006 From: leeahart at earthlink.net (Lee Hart) Date: Sat, 21 Jan 2006 14:57:58 -0800 Subject: [sebhc] H89 strange problems.... References: <200601191930.LAA05844@ca2h0430.amd.com> Message-ID: <43D2AFC2.4C2D@earthlink.net> Dwight Elvey wrote: > If the connectors haven't degraded too much, there is > another solution that I've been using for years on high > current connectors. I put silicon grease on the pins. This is a tried and true solution for high current connections. Basically, it keeps air and water away from the contact surfaces so they don't get dirty or corrode, and provides a little cooling (anything conducts heat better than air). But in this case, the fundamental problem is that the Molex pins that Heath used are only rated at 5 amps RMS, and that assumes good cooling. When you have a fully-loaded H89 with 64k memory, two disk controller, serial board, etc. the current in this connector is over 5 amps. And, the location is poorly cooled, exacerbating the problem. While we're on the subject, let me mention some things I did to improve H89 power supply reliability. The hottest spot in the H89s was that metal plate beside the power supply that held the bridge rectifier and regulators. 1. The fans were randomly oriented; some blow up, some blow down. The bridge and regulators ran cooler if the fan was oriented to blow air DOWN. 2. The Z89-37 soft sector board came with extra finned heatsinks to go on the three regulators on the power supply plate. Be sure to add them any time you have 3 or more accessory boards plugged onto the CPU board. 3. Don't run the flat cables for the disk drives across this power supply plate; it blocks airflow. Route these cables low and away from this plate. 4. The metal plate has a 90 degree angle at the bottom. Bend it a little sharper, so the top of the plate leans over the power supply PC board a little bit. This puts it *in* the airflow from the fan rather than beside it. H89s with these changes ran considerably cooler, and never had any failures of the regulators or bridge rectifier. -- If you would not be forgotten When your body's dead and rotten Then write of great deeds worth the reading Or do the great deeds worth repeating -- Ben Franklin, Poor Richard's Almanac -- Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net -- Delivered by the SEBHC Mailing List From rgroh at swbell.net Sun Jan 22 18:18:17 2006 From: rgroh at swbell.net (Bob And Bettina Groh) Date: Sun, 22 Jan 2006 18:18:17 -0600 Subject: [sebhc] Heathkit PT-19 Photo Timer - any interest? Message-ID: <43D420C9.10907@swbell.net> Cleaning the basement (again! A never ending task) and found a Heathkit Photo Timer (PT-15). Don't know (at this time) if it works - looks complete but a little dusty. No manual. Anyone interested? If so, please email me directly. Bob Groh, WA2CKY -- Delivered by the SEBHC Mailing List From RONALD.S.WEST at saic.com Tue Jan 31 09:45:53 2006 From: RONALD.S.WEST at saic.com (West, Ronald S.) Date: Tue, 31 Jan 2006 10:45:53 -0500 Subject: [sebhc] H89 strange problems.... Message-ID: <9CE060225CD128408F0B549B0A6B26BC01ED0B0A@0015-its-exmb01.us.saic.com> Robin, Any luck in solving this problem? Ron -----Original Message----- From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of Robin England Sent: Wednesday, January 18, 2006 11:33 AM To: sebhc at sebhc.org Subject: [sebhc] H89 strange problems.... Hello All Firstly many thanks for your response to my previous request for MTR ROMs for the H/Z89 machines. I have now been able to get both the machines I have booting to HDOS ok. I do, however, have a really strange problem with both of them though and I was wondering if anyone has any ideas, or previous experience of this. After a short while of being powered up (a few minutes usually), a horizontal bar starts to move slowly from the bottom of the screen to the top. When the bar reaches the top, another one starts from the bottom. At first I thought that this was due to ripple on the CRT electronics 85v supply (suspected leaky capacitor). However, a quick check with the 'scope proved otherwise and even replacement of the cap with a brand new one makes no difference. The really weird thing about these bars, is that the characters on the screen directly under the moving bar become faint and even appear to flicker and break up at pixel level. At the same time, the main logic board sometimes goes crazy; often it locks up, crashes or you can hear the floppy drive start clicking. Even stranger, is that if the main logic board is removed and the terminal board is used alone, the problem does not occur at all - you can fill the screen with characters and they all remain bright and stable. I have also been able to make the problem go away even when using the main logic (CPU) board provided that the 5v supply that powers it is obtained from a separate switch-mode PSU. All this would suggest to most people that there is a definite problem with the 5v supply to the main CPU board, however I can see no problems with the 'scope. I've even replaced all the capacitors on the separate PSU PCB plus I've even replaced the 5v and 12v regulators (TO3 package) that supply both the CPU board and terminal board, but no difference. The machines have both been in storage since the early 1990s and were working fine back then. One is a Z89 (factory built) and the other is a home built H89, one has a paper-white CRT and the other a green CRT. Both machines have a hard-sectored floppy drive built-in. Is this a known problem? Does anyone have any suggestions of other things I could try to resolve it? Thanks & regards, Robin -- Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List From robin.england at dial.pipex.com Tue Jan 31 12:47:29 2006 From: robin.england at dial.pipex.com (Robin England) Date: Tue, 31 Jan 2006 18:47:29 -0000 Subject: [sebhc] H89 strange problems.... References: <9CE060225CD128408F0B549B0A6B26BC01ED0B0A@0015-its-exmb01.us.saic.com> Message-ID: <001f01c62696$cad78670$03fea8c0@mpxp731gb> Hi Ron As luck would have it I haven't had the time to look at these machines since my email! Work has got in the way of fun! :-( As soon as I have a chance I'm going to replace the bridge rectifier and solder the connections as per the suggestions. I'll keep you posted as to the results! cheers Robin ----- Original Message ----- From: "West, Ronald S." To: Sent: Tuesday, January 31, 2006 3:45 PM Subject: RE: [sebhc] H89 strange problems.... > Robin, > > Any luck in solving this problem? > > Ron > > > -----Original Message----- > From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of > Robin England > Sent: Wednesday, January 18, 2006 11:33 AM > To: sebhc at sebhc.org > Subject: [sebhc] H89 strange problems.... > > > Hello All > > Firstly many thanks for your response to my previous request for MTR ROMs > for the H/Z89 machines. I have now been able to get both the machines I have > booting to HDOS ok. > > I do, however, have a really strange problem with both of them though and I > was wondering if anyone has any ideas, or previous experience of this. > > After a short while of being powered up (a few minutes usually), a > horizontal bar starts to move slowly from the bottom of the screen to the > top. When the bar reaches the top, another one starts from the bottom. At > first I thought that this was due to ripple on the CRT electronics 85v > supply (suspected leaky capacitor). However, a quick check with the 'scope > proved otherwise and even replacement of the cap with a brand new one makes > no difference. > > The really weird thing about these bars, is that the characters on the > screen directly under the moving bar become faint and even appear to flicker > and break up at pixel level. At the same time, the main logic board > sometimes goes crazy; often it locks up, crashes or you can hear the floppy > drive start clicking. > > Even stranger, is that if the main logic board is removed and the terminal > board is used alone, the problem does not occur at all - you can fill the > screen with characters and they all remain bright and stable. I have also > been able to make the problem go away even when using the main logic (CPU) > board provided that the 5v supply that powers it is obtained from a separate > switch-mode PSU. > > All this would suggest to most people that there is a definite problem with > the 5v supply to the main CPU board, however I can see no problems with the > 'scope. I've even replaced all the capacitors on the separate PSU PCB plus > I've even replaced the 5v and 12v regulators (TO3 package) that supply both > the CPU board and terminal board, but no difference. > > The machines have both been in storage since the early 1990s and were > working fine back then. One is a Z89 (factory built) and the other is a home > built H89, one has a paper-white CRT and the other a green CRT. Both > machines have a hard-sectored floppy drive built-in. > > Is this a known problem? Does anyone have any suggestions of other things I > could try to resolve it? > > Thanks & regards, > Robin > > > -- > Delivered by the SEBHC Mailing List the > -- > Delivered by the SEBHC Mailing List -- Delivered by the SEBHC Mailing List