Problem with DEC LSI11 / KD11-F

I have been browsing through some of my old Qbus boards and found one KD11-F (M7264) CPU with 4 k word memory, a couple of KD11-HA (M7270) , a KDF11-A (M8186) and some assorted memory boards and some SLUs. All CPUs seemed to work except for the KD11-F board, which was a bit sad since that was the original LSI-11 board. I looked at bitsavers for schematics. Indeed there was one, but my board revision seems to be older. It is not matching layout wise and it has plenty of patches. Is there a print set for the older revision of the board? Well, I am not giving up that easy. The clock signal was there so I attached the logic analyzer over the control chip and was able to find out the micro address (sampled at falling PH2 clock) and data (sampled at falling PH1 clock). The strange thing was that it was not starting at address 1. It starts of at 89 hex, then steps to 8A and then to 39D. The data returned is FFFF, FFFF and 708A (forever). FFFF is supposed by NOP. 708A is also some other valid micro instruction. (according to the EK-KUV11-TM_LSI11_WCS.pdf <http://www.textfiles.com/bitsavers/pdf/dec/pdp11/1103/EK-KUV11-TM_LSI11_WCS.pdf> ) Is the micro code source / dump for the LSI-11 available somewhere? If I remove one of the MICROMs it starts at 1 and goes on 2,3,4,5,6, etc. My guess is that one of the MICROMs are bad, forcing some bits low. Or maybe the strange precharging isn't working? Now, I have several M7270. I could sacrifice one board to get the other working. But are the chips identical? The markings on the chips are not identical. The M7264 board has the following chips: CP1611B-51 2111549 CP1621B451 23001C201 CP1631B-10 23088A501 CP1631B-07 23087A501 The M7270 board has the following chips: 1611H 21-15579 3007D 23-002B5 3010D 23-001B5 2007C 23-002C4 Is there a engineering drawing printset for the M7270 (KD11-HA) somewhere? /Mattis