> From: Oliver Lehmann <lehmann at ans-netz.de>
> Subject: Re: Zilog System 8000
> So - none has a S8000... at home? ;)
The MARCH computer museum at New Jersey's Infoage
has a Zilog Z8000 model 21.
Sadly, I scrapped my model 21 and 31 when Linux overtook
Unix as the preferred software developer's platform.
I still have some pieces (SMD hard drive)
but I gave away some of the main boards
to someone claiming to want them for the CPUs.
I'm unsure how to get it running from bare boards
because I suspect the backplane
was not just parallel connectors.
All the slots were specific to the CPU, RAM,
disk controller, serial ports, tape drive, etc.
How I wish I had photos of the Exxon Office Systems office
in New York's Rockefeller center in 1982 when they were selling
the Zilog System 8000 running the Zeus OS as servers
to Z80 systems running Z-net (their proprietory coax network).
Only a few years later at the NJ Trenton Computer Fest,
a fellow was selling a pair from the back of a red pickup truck.
What a fall from grace!
> I'm missing a backplane so I tried at first hooking up power on my CPU
> module and connecting a serial interface to the tty1 (console) pins of
> the bus-connector.... powering on the system makes the cpu getting a bit
> warm but my console is quiet :( I'm not sure if I've to connect some
> other pins as well with +5V or GND. NMI... RESET whatever... so I
> wonder if someone has a S8000 at hand and can measure some things?
I suspect you'll need the front panel
with the reset and interrupt buttons (and a few LEDs)
to invoke the ROM monitor.
Or at least know where they connect.
Yes, I miss having a real ROM monitor
but it was no fun working on an abandoned system by myself.
> From: "Paxton Hoag" <innfoclassics at gmail.com>
> Subject: Re: Zilog System 8000
> I have a card set and backplane saved from a machine that went to
> scrap, nothing else. It is lost in my container.
I saved the hard drive since I was hoping to use it on another system,
failing to predict the amazing velocity of new technology
becoming available to everyone.
Anyone know of a decent memory test utility that runs on classic macs (68k
I have an old Mac Portable that I'm struggling to get an OS on -- I
consistently get "bad F-line instruction" traps when booting from System 7
disks (floppies and CD-ROMs), which from what I can tell probably means bad
memory. I'd like to find out if it IS memory, and if so, whether it's the
onboard 1mb (I hope not) or on the 4mb expansion...
My internet searches have come up dry (I've found stuff for OS X, and early
PowerMacs, but nothing for the 68k line).
Yah, I done that. The key is to find an MFM drive that has the
same or greater Cylnder/Head geometry: It has to have at least
the same number of cylnders, and at least the same number of
Keep in mind, though, that geometry alone does *NOT* guarantee
that this will work!! The 9133 seems to be allergic to some
MFM drives-- I could get most Seagate drives to work, for example,
but not NEC's. My fave at the time was the Quantum Q540. I
'wasted' over half the drive, but I had alot of them at the time!
When you format such a drive, you will not have a capacity
greater than the original.
 Not quite true for the older 9133 V/X/XV drives. If you have
a 'V' for example, you can replace it with a bigger drive, adjust
the jumpers inside, and format for 10 or 15MB.
-- Jos Dreesen / Marian Capel <jos.mar at bluewin.ch> wrote:
Closely related to the previous post : I actually have an ST419, but is in use inside a HP9133D.
Looking back to old classiccmp articles indicate that it is not easy to replace the ST419 by other MFM drives of different geometries.
Has this changed ? i.e can somebody report a success in replacing the internal drive of an HP9133 ?
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