[sebhc] Z-37 Diag Disk

Lee Hart leeahart at earthlink.net
Sun Mar 20 02:30:35 CST 2005

Mark Garlanger wrote:
> Does anyone have the Z-37 Diag. Disk that is described in the Z-37
> Operation manual? I didn't see it in the archive. It looks like
> I may be able to get two Z-37 controllers, but their condition is
> unknown. It would be nice to be able to do more testing than to
> simply try it with some drives.

Yes, I have them, and will mail you a copy. There are two; one in H17
format and one in H37 format. Basically, it is an HDOS bootable disk
with the H37 test programs on it.

Background: For many months now I've been trying to get a Z89-37 board
working for Mark. I have a perfect Zenith board; except it doesn't work.
I've changed every single IC, and checked the remaining discretes as
thoroughly as I can, and it *still* doesn't work. I'm ashamed to admit I
can't fix it.

But, I have a stash of bare Z89-37 boards. So, I have built one of them
up for Mark. But, its still shy a few parts; specifically the 25-pin
Molex bus connector P2, the 16 MHz crystal oscillator U9, and the
resistor networks RP1 and RP2. I'm also short some ICs (the Heath 444-81
and 444-82 PALs, WD1691, and WD2143M-03) but I can cannibalize the dead
boards for them (I know the chips are good because they work on my good

If someone can help find the missing parts, not only can I finish Mark's
board, but I'll have parts so that others can build these rare boards
for their H89s.
Ring the bells that you can ring
Forget your perfect offering
There is a crack in everything
That's how the light gets in
	-- Leonard Cohen, from "Anthem"
Lee A. Hart  814 8th Ave N  Sartell MN 56377  leeahart_at_earthlink.net

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