Type 0 Complex
Type 0 Minus No L2 Cache
U2 82385 Cache Controller - also on 20 / 25 MHz 8580 planars,
and 8570-Axx CPU boards.
Supports (4) 85 ns and 80 ns 2 MB SIMMs on the risers and 8 MB on an expansion card. Supports Spock from one to three can version. Most likely the short Tribble as well.
From Rich Wolos:
Type 0 and 8590 Planar DBA ESDI Support
Update from Daniel Hamilton: Confessions of a Model 90 386 (update)
I took down my Model 90s today and booted them
up. I started up the old 402 and got another itch to try to do
something with those ESDI ports. I experimented back in early
2006 with this (I went and found my old posts here before trying again,
to make sure I wasn't repeating mistakes of the past). :)
However, this time I found out something that partially disproves
something I had revealed here back then. My original post read:
8590-402 reveals more secrets...
Q: Is ESDI bootable on a Type-0 Processor Complex?
The answer is not incorrect, but it is *incomplete*. The
correct answer is Yes AND No actually. ESDI will boot with the T0
I found today. The catch is that it just cannot be the IML drive.
What I did before was remove the Spock adapter and therefore
removed the original 160MB SCSI disk that came with the system (which
was the IML disk as well). However if the SCSI adapter/disk is
NOT removed, the ESDI drive works just fine, and actually will preempt
the SCSI disk in the boot sequence by default!
I can see how this would have helped upgrades from Model 70s
(which I've read postulated elsewhere is a major reason for the Model
90s). A administrator could simply remove the hard disk from a
production Model 70 and just stick it in a new Model 90 and turn it
on...presto, the system boots up with the ESDI disk as C:, and the fast
SCSI disk sets waiting as D: drive. Neat.
So a correction 4 years in the making is...Q: Is ESDI bootable on a Type-0 Processor Complex?
A: Yes: ESDI disk will boot as long as another IML-capable disk is installed on the system. IML Error I9990080 (IML not supported on primary disk drive) will occur if only the ESDI disk is installed.
ESDI Support for Convenience Partition?
Tim Clarke opines:
Type 0 Success in 8595-OH9
The Type 0 will work in an 8595-0H9, with some patience. First putting in a spare T0 would result in no video. Taking other T0 out of working -402 and placing it into -0H9 worked. After video was achieved with this T0, swapping back the previously non-working T0 would work also. Do some T0's have more "kick" to them? They some are leaders, some are followers.
Working -0H9 configuration was stock, except for the changing
memory from 70 ns non-parity to 80 ns parity (Model 70 386 memory). -0H9
had "newest" SCSI w/Cache. -402 had older SCSI w/Cache but made no difference.
Type 0 Booting Experiences
I got it to work in another 8590-0H9. The weird thing (and telling) was this...
I have a second T0 complex (I had before getting the 402), here-after
referred to as T0-2. T0-2 would not work initially if swapped with the
original T0 in the 402. No video. I then flipped the password-reset jumper
on the planar. Put T0-2 back in, and it worked. Great, now I know the
I just got the 0H9. It came with a T2 complex. I checked the
planar, same FRU as the one in the 402. So I swapped the memory for
some 80 ns parity memory (2x 2 MB). Went ahead and flipped the password-reset
jumper. Powered up, no video, nothing. I was stumped. So
then I took the T0 in the 402 and put it in the 0H9. Viola, it worked.
Okay, what's going on? I put T0-2 back in AND IT ALSO WORKED,
although it wouldn't just minutes earlier. So I had two functional
T0 machines functioning. I seemed to finally have the recipe for success.
The recipe is: One 8590 with Spock SCSI. Put at least 1 PAIR of 80 ns
Parity SIMMs in (Model 70 386 Memory). Flip the password-reset jumper.
Cross your fingers and push the power switch.
Type 0 Difficulties in 9595
Daniel Hamilton's story with 9595s:
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