Interesting Z89 I/O board

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glenn.f...@gmail.com

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Jan 18, 2022, 9:07:33 AMJan 18
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p.s. in looking through my doc’s to answer Jeff’s question I came across a manual for the Z-89-11 which was a Multi-Function I/O card that contained an 8250 UART, 2661 Enhanced Programmable Communications Interface (EPCI), and 8255 parallel port.

 

I’m no Z89 expert but I was not aware that Heath made such a card!

 

I seem to have the complete document (albeit a photocopy) including schematic…

 

  • Glenn

 

 

 

From: glenn.f...@gmail.com <glenn.f...@gmail.com>
Sent: Tuesday, January 18, 2022 9:00 AM
To: se...@googlegroups.com
Subject: RE: [sebhc] Hello - serial question

 

Not sure how reliable your test is. Would seem to depend on how your CP/M is configured?

 

Attached is a loopback test procedure from the service manual. Perhaps this will be useful?  You’ll need to key in the code from the ROM monitor prompt.

 

  • Glenn

 

 

From: se...@googlegroups.com <se...@googlegroups.com> On Behalf Of Jeff G
Sent: Monday, January 17, 2022 11:05 PM
To: SEBHC <se...@googlegroups.com>
Subject: [sebhc] Hello - serial question

 

 

Hey everyone - not sure how I found this group but I've had an H89 sitting on the shelf for some time that I've been meaning to play with. I was curious about the serial ports on it and after doing a little testing, determined that at least the DTE port wasn't working. I was following Herb's post here: https://retrotechnology.com/restore/h89_trans.html and figured that I may be able to at least see some activity on the serial line by doing something like:

 

pip pun:=a:\test.txt   (I created a test file)

 

or even something like: pip pun:=con: (and type some letters in) would get some activity over the port, but I had nothing.

 

I opened the case and found that the DTE connector was connected to P603 and not P605, so I went to correct that, and unfortunately managed to re-install the card one pin off, which managed to un-install the 7912 regulator.

 

So while I fix the 7912; can anyone tell me if my PIP commands above would work, at least do something? I have a handful of disks but the one I'm booting on has corruption or the floppy drive isn't too happy. It boots and works but complains about bad sectors a lot.

 

Thanks!

 

Jeff

 

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Terry Gulczynski

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Jan 18, 2022, 10:12:50 AMJan 18
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Glenn,

One of the main additions in shifting from CP/M 2.2.03 to 2.2.04 was the
addition of Z89-11 drivers. The parallel port was programmed as a
standard Centronics port. It also came with a cable that converted the
25-pin D connector to a Centronics connector (36 pin?) on the printer
side of the cable.

I still have the one I bought in the early 80s. I'm thinking the cable
is still around here somewhere, too.


Terry


On 1/18/2022 9:07 AM, glenn.f...@gmail.com wrote:
> p.s. in looking through my doc’s to answer Jeff’s question I came across
> a manual for the Z-89-11 which was a Multi-Function I/O card that
> contained an 8250 UART, 2661 Enhanced Programmable Communications
> Interface (EPCI), and 8255 parallel port.
>
> I’m no Z89 expert but I was not aware that Heath made such a card!
>
> I seem to have the complete document (albeit a photocopy) including
> schematic…
>
> * Glenn
>
> *From:* glenn.f...@gmail.com <glenn.f...@gmail.com>
> *Sent:* Tuesday, January 18, 2022 9:00 AM
> *To:* se...@googlegroups.com
> *Subject:* RE: [sebhc] Hello - serial question
>
> Not sure how reliable your test is. Would seem to depend on how your
> CP/M is configured?
>
> Attached is a loopback test procedure from the service manual. Perhaps
> this will be useful?  You’ll need to key in the code from the ROM
> monitor prompt.
>
> * Glenn
>
> *From:* se...@googlegroups.com <mailto:se...@googlegroups.com>
> <se...@googlegroups.com <mailto:se...@googlegroups.com>> *On Behalf Of
> *Jeff G
> *Sent:* Monday, January 17, 2022 11:05 PM
> *To:* SEBHC <se...@googlegroups.com <mailto:se...@googlegroups.com>>
> *Subject:* [sebhc] Hello - serial question
> <mailto:sebhc+un...@googlegroups.com>.
> <https://groups.google.com/d/msgid/sebhc/29866ea2-7a6b-40b9-9b95-ebe7315d3b55n%40googlegroups.com?utm_medium=email&utm_source=footer>.
>
> --
> You received this message because you are subscribed to the Google
> Groups "SEBHC" group.
> To unsubscribe from this group and stop receiving emails from it, send
> an email to sebhc+un...@googlegroups.com
> <mailto:sebhc+un...@googlegroups.com>.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/sebhc/009c01d80c74%24ba811130%242f833390%24%40gmail.com
> <https://groups.google.com/d/msgid/sebhc/009c01d80c74%24ba811130%242f833390%24%40gmail.com?utm_medium=email&utm_source=footer>.

Glenn Roberts

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Jan 18, 2022, 10:27:43 AMJan 18
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Thanks for enlightening me Terry. looks like a nice card to have.
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norberto.collado koyado.com

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Jan 18, 2022, 11:47:34 AMJan 18
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I did copy the 8255 parallel port from the Z-89-11 card and added to the H8-SSI board with minor enhancements. I tested under HDOS and it worked fine. I reconfigured to use the standard IBM cable which you can buy from Amazon. It plugs directly from the board into the printer. No needs to do any cable re-wiring.




From: se...@googlegroups.com <se...@googlegroups.com> on behalf of Glenn Roberts <glenn.f...@gmail.com>
Sent: Tuesday, January 18, 2022 7:27 AM
To: se...@googlegroups.com <se...@googlegroups.com>
Subject: RE: [sebhc] Interesting Z89 I/O board
 
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