--- Joe <rigdonj(a)intellistar.net> wrote: Thank you for these. I have been (slowly) restoring an H-11 I recovered years ago on his H-11 (KDF-11) and my 11/23 (the target system was an 11/73 w/4Mb RAM, Fuji Eagle, the works, running TSX-11 - I loved the fact that I could develop on a system I paid $300 for and deliver code to a machine that cost >$10K). I'm still on the lookout for the schematics for the Heathkit floppy interface. Mine siezes the bus such that on power-on, I never get an ODT prompt. If I put a gap in the Qbus, I can run the CPU, see the I/O registers on the floppy card, etc., but, of course, it doesn't boot up fully - it seems to read in the boot block, but as soon as RT-11 turns up interrupts, because of the break in the grant chain, they, of course, never come. I really just need to know what chips have their fingers in the interrupt handling and to probably just replace them. My board is socketed and I have checked all the TTL chips with an IC tester. I'm down to the Heath/DEC bus driver/receiver parts. Thanks, -ethan ===== Even though my old e-mail address is no longer going to vanish, please note my new public address: erd(a)iname.com The original webpage address is still going away. The permanent home is: http://penguincentral.com/ See http://ohio.voyager.net/ for details. __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/