Ethan,
I'm pretty sure I have a copy of the H-27 manual(s). Do you still need
them? What exactly are you looking for?
Gary
> -----Original Message-----
> From: Ethan Dicks [mailto:erd_6502_at_yahoo.com]
> Sent: Saturday, December 29, 2001 7:01 PM
> To: classiccmp_at_classiccmp.org
> Subject: Jumper settings needed for Heath H-27 disk controller
>
>
>
> 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 Tue Jan 08 2002 - 15:22:33 GMT