[sebhc] Image transfer problems

Dwight K. Elvey dwight.elvey at amd.com
Mon Jun 14 21:49:08 CDT 2004

 If you try to dump from a programmer, make sure
to disconnect the VPP or if your programmer lets
you, set it to 5v. If you disconnect, wire it
to +5v. I've not found the magic combination
to do the full dump but I was able to get the
XCON8 half with the generic 2732 setup and
VPP set to +5V. I've made up a test socket
to play with these pins to see what addressing
they do that is different than the EPROM. The
mask ROMs often swap selects with address lines.
It might even be the VPP pin that is A11. The
A11 pin seems to be a select pin on the ROM I
have. I just haven't had time to play with it yet.

>From: "Jack Rubin" <jack.rubin at ameritech.net>
>The XCON manual lists 444-70 and 444-74 as "equivalent" but it would be
>nice to see a ROM dump of your -74 to see if there is any difference.
>> -----Original Message-----
>> From: sebhc at sebhc.org [mailto:sebhc at sebhc.org] On Behalf Of 
>> Carroll Waddell
>> Sent: Monday, June 14, 2004 8:47 PM
>> To: sebhc at sebhc.org
>> Subject: Re: [sebhc] Image transfer problems
>> TO Dwight & Jack:
>> I just thought of something. The XCON8 rom I've heard you 
>> talking about 
>> is pn 444-70.
>> My XCON8 ROM is pn 444-74.
>> I don't know if this makes any difference at all.
>> CEW
>> Jack Rubin wrote:
>> >I'm really itching to work with you guys, but right now my 
>> son is still 
>> >inhabiting my "workshop". He goes back to school next weekend, so I 
>> >should be back on line with the Heathkit world then.
>> >
>> >Jack
>> >
>> >  
>> >
>> >>-----Original Message-----
>> >>From: sebhc at sebhc.org [mailto:sebhc at sebhc.org] On Behalf Of
>> >>Dwight K. Elvey
>> >>Sent: Monday, June 14, 2004 7:29 PM
>> >>To: sebhc at sebhc.org
>> >>Subject: [sebhc] Image transfer problems
>> >>
>> >>
>> >>Hi All
>> >> I'm working right now with Carroll to solve his issues
>> >>with my program. I suspect that it may be an issue
>> >>with his serial being a little flaky but it may also
>> >>be some RAM location that I'm not setting or resetting
>> >>correctly. We are working with a XCON8 and H8-5 right now, 
>> >>one of the configurations that I'd not checked. I've checked 
>> >>the PAM8 and H8-5 as well as the XCON8 and H8-4. I do have 
>> >>some code working on my machine with the XCON8 and H8-5 that 
>> >>I did over the weekend but I still am a little suspicious of 
>> >>some RAM that isn't being initialized correctly. My code 
>> >>depends on the H17 code heavily and there are a lot of 
>> >>variables to worry about. I'll be doing some testing tonight 
>> >>where I'll clear the RAM with 000's and then with 377's to 
>> >>make sure I didn't miss something.  If anyone else can try 
>> >>the code and report back, I'd like to hear about it. I'd like 
>> >>to make the next release as robust as I can. Dwight
>> >>
>> >>
>> >>--
>> >>Delivered by the SEBHC Mailing List
>> sebhc-request at sebhc.org.
>> >>
>> >>    
>> >>
>> >
>> >--
>> >Delivered by the SEBHC Mailing List
>> >
>> >  
>> >
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