[sebhc] HDOS sysgen questions (and problems)

dwight elvey dkelvey at hotmail.com
Tue Jan 9 00:01:42 CST 2007

Hi Bob
As I recall, the H89 did an auto detect on the speed. I believe
that the H19 part is set to 4800baud but I could be wrong on
that, it may have been 9600.
It sounds like you may have a RAM issue or socket issue for the
serial chip. You should be able to make up a simple wire to connector
to monitor the comunications with a PC in the serial mode.
I don't recall if there was a jumper select on the H89 side for
the buad rate but it seems like I recall on on the H19 side.
I've not tried the CP/M so can't comment on that.

>From: "Bob Shannon" <bshannon at tiac.net>
>Reply-To: sebhc at sebhc.org
>To: <sebhc at sebhc.org>
>Subject: Re: [sebhc] HDOS sysgen questions (and problems)
>Date: Mon, 8 Jan 2007 18:25:20 -0500
>Happy New Year,
>Getting back to old computers once again, I tested the disk Mark kindly
>sent.  The machine 'seems' to boot, but I get gibberish on the console.
>Typing seems to echo gibberish, sure looks like a baud rate issue to me.
>I don't have much documentation, and what I have is not what I expect
>from Heath.  So how do I figure out what baud rate my H19-part and
>my H89-part are speaking to one another?
>What baud rate is the CP/M disk image expecting?
>Just how easy is it to 'jumper' the H89-part to something other than the
>H19-part?  It would be really cool if you could do that from outside the
>----- Original Message ----- From: "Mark Garlanger" <garlanger at gmail.com>
>To: <sebhc at sebhc.org>
>Sent: Wednesday, November 29, 2006 6:35 PM
>Subject: Re: [sebhc] HDOS sysgen questions (and problems)
>>I sent out a copy of CP/M on soft-sectored disks to Bob Shannon, maybe
>>he'll have a chance to make an image of it. I didn't have time to make
>>a soft-sectored HDOS disk though, and won't be able to do anything
>>with my heath computers until after the New Year.
>>Have you looked at the 'unofficial' HDOS 3.0 images that are in the
>>archives? If I remember correctly, the notes mentioned that they are
>>soft-sectored images but I haven't had a chance to played with them to
>>verify that.
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