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…
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.
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.
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