Hi Bill, > ________________________________________ > From: cctalk [cctalk-boun...@classiccmp.org] on behalf of Mark G Thomas via > cctalk [cctalk@classiccmp.org] > Subject: KDJ11-B PDP 11/73 getting stuck in Exit standalone mode diag #56 > > Hi, > > I picked up an empty 4x8 Q-bus chassis at VCF-East this year. It's > labelled "USDC CSS-823 Processor System" on the outside. It's not a DEC > backplane, but the chassis is light aluminum, smaller and in some ways > nicer than my pile of BA23s. It includes a switching power supply, > LTC and q-bus termination, and I confirmed it's wired for Q22. I was > hoping to transplant an 11/83 into it, since it will fit more comfortably > in my work area. It has lit DCON/RUN/LTC/HALT buttons on the front pane. > The etching on the backplane says something like "MDB Systems, Inc. > East Orange, CA 92665" > > Unfortunately, I discovered slots are all wired Q22/Q22, no top ABCD > (Q22/CD) PMI slots like a BA23. So, not good for an 11/83 CPU wired > for PMI on slots C-D. > > So, I was hoping I could get my KDJ11-B (quad-wide 11/73) running in it. > Upon power up or reset I get "Testing in progress. Please wait" on > the serial console, and the LEDs get stuck on test 56. CTRL-C doesn't do > anything yet, and my only options seem to be to hit reset, or if I hit the > run/stop toggle, I can reset to the ODT prompt. This is with either just > the KDJ11-B in the top slot, or with the addition of a suitably configured > MSV11-QA in the next slot. If I turn off the LTC on the front panel, > I get the expected Error 61 M8190 clock error, PC and register values, > and options to re-run once or loop on test, so I know the LTC is working. > > I confirmed the KDJ11-B works fine in a BA23, getting past test 56. I also > tried an 11/53 CPU here in the ABAB backplane and that gets past the self > tests into dialog mode, but I really would like to get the KDJ11-B working > in this chassis. I do see that a couple traces to the KDJ11-B C-D slots > besides the Grant Continuity connections. I assume since the KDJ11-B > has those Grant Continuity connections on slots C-D, it can run in a > qbus/qbus Q22/Q22 quad Q-bus slot. > > I noticed the FP "RUN" lamp never comes on (and is not burned out), but maybe > that's normal -- monitoring something on the bus that doesn't happen during > power on self test. > > Does anyone here have suggestions about next steps in diagnosing this? > > https://archive.org/stream/bitsavers_decpdp1111aintNov86_5833755/EK-1184A-MG-001_1184maint_Nov86_djvu.txt > ----------------------------------------------------------------------------- > 4.10.18 Exit Standalone Mode (Test 56) > > In the 22-bit mode, the exit standalone mode is checked by using the > guaranteed timeout address of 17 760 000 to verify that the timeout > logic works without hanging up the CPU. > -----------------------------------------------------------------------------
On Wed, Apr 05, 2017 at 03:02:55PM +0000, Bill Gunshannon via cctalk wrote: > OK, I have the book on that. You need to determine which backplane you have. > MLSI-BPA84-T Serpentine A-B-A-B > MLSI-BPA84-A-T Serpentine except for slots 6 and 7. > > We'll ignore the MLSI-BPA82 as that's just a dual wide A-B. > > I will see if I can scan the book and send it to you but no promises how > soon. It's pretty good sized and my scanning capabilities are primitive. > > bill I didn't realize the M8190 (11/73) was PMI, and really the same board as my 11/83. Fortunately, there was definitely no smoke, and the 11/73 still works fine in my BA23. I think the magic smoke problem might be more likely if someone plugs a Q22 board into PMI slots, due to the unfortunate wiring of those grant continuity connections. I cannot find anything like BPA84-anything on this backplane. There is a tiny whale emblem on the trace side of the board saying something like "MO__ Quick" under it, though faint, and bold easy to read "MLSI-CHASSIS #40040328" close to the end with the power terminals. I confirmed with a meter that all slots are A-B-A-B, including 6 and 7. I'm not sure I need the manual, unless it also includes schematics for the power supply, RTC, and front panel control electronics wiring. I'm now up and running with a dual-wide M8192 from a batch from a scrap board guy on ebay, and an M7195 borrowed from another system for testing. Next challenge is figuring out the jumpers on an M8043 for SLU console and seeing if I have or can find a working SCSI controller with a boot ROM on it, since I don't have another M7195 and they seem to go for high prices these days on e-bay when they do show up. Mark -- Mark G. Thomas (m...@misty.com), KC3DRE
