24 Jul
1998
24 Jul
'98
4:03 a.m.
At 01:47 AM 7/24/98 -0500, you wrote:
Keep in mind, these things were in vogue back in the days when the *users*
actually *expected* to get the schematics! My how times have changed . . .
The Z-67 is a rare item indeed. I missed one in 1988. That's the last time
I ever saw one offered for sale (and it was *just the interface*). I don't
know anybody running one of these . . .
My Z-89 dosen't run anymore. Too many years of disuse, I guess.
Jeff
I almost forgot to post about this. I recently acquired a complete
Heathkit H89 system, with dual floppies and a small printer (OkiData
Microline 82, serial), all in excellent condition.
I got with it a bunch of manuals and floppies, among them CP/M boot
diskettes. As I recall, this is a Z80-based system, yes? Is it possible to
It's roughly the same thing as a Zenith Z90. I have the manual here (it
claims to be a user manual, but it contains schematics, PCB layouts,
theory of operation, etc). It's a Z80-based machine with 48K or 64K RAM,
3 serial ports as standard (+ the one for the built-in Z19 terminal), and
a variety of disk controllers. use a hard
drive on it?
I believe there was a hard disk for it. I don't have one, and don't have
any info on it.
I believe you could use the following disk units :
Z17 (hard sector 5.25")
Z37 (soft sector 5.25")
Z47 (8")
Z67 (hard disk).
-tony
24 Jul
24 Jul
9:55 a.m.
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10:29 a.m.
New subject: Z-67 was Re: Rescued: Heath H89
Jeff Kaneko wrote:
The Z-67 is a rare item indeed. I missed one in 1988. That's the
last time
I ever saw one offered for sale (and it was *just the interface*). I
don't
know anybody running one of these . . .
My Z-89 dosen't run anymore. Too many years of disuse, I guess.
I would dearly love to get my hands on the schematics for the Z-67
unit. I have a non-working unit containing both the HD and 8" floppy.
I've probably had it for 10 years or so, and I *think* it came with the
working system unit, but I have never been able to get the Z-67 up and
running <sigh>. When I started checking it out, it seems to me that the
P/S unit was giving problems.
11:14 a.m.
New subject: Z-67 was Re: Rescued: Heath H89
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2:02 p.m.
New subject: Z-67 was Re: Rescued: Heath H89
Tony Duell wrote:
The only thing I remember was that the board was about 12" x 16" or so
in size, some of the outputs were putting out voltage, it seemed to also
be the interface card for both the floppy and the HD, and that is about
it. I tend to try and get as much documentation as I can on anything
related to the 70's & early 80's computers that I mostly collect. Right
now, I just don't have the time to get into the machines the way I used
to. Hmmm, maybe that is a good thing :). At any rate, I won't be doing
anything with it in the foreseeable future except to keep my eyes open
for other documentatation.
I would dearly love to get my hands on the
schematics for the Z-67
Time to learn the gentle art of Reverse Engineering? Probably quicker
to do that than to track down schematics. running
<sigh>. When I started checking it out, it seems to me that
the
P/S unit was giving problems.
Remember I've never seen one, but :
How complex can this power supply be? In the Z90 and the dual 5.25"
drive
that I have, the PSUs are so simple that I could fix them without a
schematic. Even using only a test lamp :-). 
26 Jul
26 Jul
12:26 a.m.
New subject: 8 Bit Computer items for sale
I have a lot of old 8 bit hardware and software items for sale on my web site.
Two fun Riddles on the home page also.
------------------------------------------------------
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gene(a)ehrich.com
Gene Ehrich P.O. Box 209 Marlton NJ 08053-0209
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ard＠p850ug1.demon.co.uk -
gene＠ehrich.com -
jeff.kaneko＠ifrsys.com -
marvin＠rain.org