Jumper settings needed for Heath H-27 disk controller

-----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 __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com