23 Mar
1997
23 Mar
'97
8:16 a.m.
A.R. Duell wrote:
Yep. I've gone through many of these at work (in the 70s) and they
always fail the same board. It has lots of analog circuitry on it and I
suspect it is that part of it.
I have two computer systems that use them
(Intellec 800 and Series II)
and three sets of controller boards. However, two sets of the
controller boards have a failed board each. Anyway, I have one good
set, so I can run either system, just not both at the same time.
I assume it's the same board in each set :-( What's the fault? I have schematics of that
controller somewhere, so it
should be possible to fix the existing one. I have no idea where to find
the custom multibus interface chip or the 3000-series bit slice stuff any
more, but unless the same chip has failed on both boards, you might be
able to make one good one from the 2 dead ones.
The fault is very non-specific. When trying to boot it just returns a
disk read failure. At that point the rom monitor is the only thing in
charge and it is small. I thing it just says "error". I may try it
again so I can be more specific. When we used them at work they were on
a service contract, so I never had to mess with them. Just isolate
which board was bad.
If I get desperate I may try to fix it, but for now with one good set I
can limp along. Don't use them very often, usually just to get files
off of 8" diskettes. I also have the schematics. Thanks for the offer.
--
Dave Mabry dmabry(a)mich.com
Great Lakes Maritime Institute Underwater Research Team
NACD NSS-CDS #42872