22 Feb
2000
22 Feb
'00
11:16 a.m.
Al Kossow wrote:
there is a dissassembly of the boot rom for the 990/4
up at
www.spies.com/aek/orphan.html now, along with one for the 990/12.
I'll be looking at it for clues. Thanks. I have a suspicion there are
going
to be some major differences, though.
If you have a way to dump the boot proms, it would be interesting
to see how similar they were.
It has a couple of EPROMs on the I/O processor board. Don't have any
way to dump them at the moment but will soon.
If you have a way to take pictures of the boards, I'd be curious
to see what the I/O cards look like, esp the floppy controller
board.
I have a video camera and a capture board I'm putting in another
machine.
Hopefully sometime this week. Will let you know.
When I first saw the boards, I thought they might be TM990/100M modules,
but
they only have 86 pins, not 100, and the bus edge is centered, not
offset like
the 990/100M, and not split like the 990/10 (or 4) 13-slot chassis.
Release levers
only on one end. Little rubber bumpers where a lever would go on the
other end.
The floppy controller board looks like mostly glue logic and a few
drivers. I suspect
the I/O processor does most of the work.
jbdigriz
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Tagline for Tuesday, February 22, 2000
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James B. DiGriz - jbdigriz(a)dragonsweb.org - (912) 653-5139
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