I could go and check ... AFAICR I also have a stack of listings that belong to XXDP programs. When a stop/halt occurs at an address, you read the listing of the XXDP diagnostic program to learn near the address where the stop occurred for what reason that stop occurred. I'll report back later! - Henk. -----Original Message----- From: cctalk-bounces(a)classiccmp.org To: info-pdp11(a)village.org; General Discussion: On-Topic and Off-Topic Posts Sent: 21-12-2004 17:27 Subject: Old Unibus PDP-11 XXDP diagnostics Does anyone have any info/documentation on the XXDP diagnostics for older PDP-11 systems and peripherals? I'm looking in particular for the 11/40 (11/35), RK05, DZ11, RL02, MM11 core memory, RX01, RL01 diagnostics. I have found some info on Henk's site, but would like to know if anyone has a comprehensive list and hints on how to run these, what the output means, how to answer the prompts, etc. I have created RL02 packs with XXDP 2.5 and XXDP 2.2 and I can boot and run stuff from these packs. It appears that the 11/40 diagnostics are on XXDP 2.2, but not on XXDP 2.5. I have an old 1976 DEC field rep troubleshooting guide that refers to various MAINDECs, which seem to have been the diagnostics prior to XXDP. Is there a list somewhere showing what the XXDP equivalents of the old MAINDECs are? Any help would be appreciated. I want to exercise my 11/40 and attached peripherals and see if any subtle gremlins are lurking anywhere within. Everything appears to be working perfectly with the exception of one of my three RK05 drives that I knew was problematic. Ashley