Jumper settings needed for Heath H-27 disk controller - test-drb@ccmp.vtda.org

8 Jan 2002

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@yahoo.com]
 Sent: Saturday, December 29, 2001 7:01 PM
 To: classiccmp(a)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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