As I've mentioned before, I have a Heathkit H-11 with standard Heathkit
disk controller. The disk controller locks up the CPU if it's in place
in the interrupt chain (it will begin the boot process if it's behind
all the cards with a gap in the grant chain, but after loading the boot
sector and turning on interrupts, the OS, naturally, won't run).
So... I have tested all the TTL chips in a chip tester. What I can't
test are the 88xx bus chips. From tracing the grant pins, I think
the 8837 is what hangs off the interrupt lines. I have finally found
some (unsoldered) loose replacements. What I still lack are schematics
or at least a jumper map.
The jumpers have been soldered and cut and resoldered before I received
the card. As a result, I have no idea what they are supposed to be set
at. Does anyone know the state of the jumpers for default operation?
Thanks,
-ethan
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Received on Sat Dec 29 2001 - 18:01:05 GMT