Does anyone have a pair of (working) MS11-M memory modules (any size, both the same) in a PDP-11/24 or /44? [I believe those were the only models to support that memory.] If so, could I talk to you offline about how they interleave? Background: I'm working on a memory simulator for SIMH (PDP-11). I have it working with most parity memory models and the ECC models as well. [The MS11-M uses 7-bit ECC.] I have the MS11-M successfully simulated in a non-interleaved manner now. I'm struggling with getting interleaving to work correctly with the diagnostics. What I'd like to do is give someone a short fragment of code to execute on their machine and let me know the results. This would help me finish the simulation. Yes, I have carefully examined the documents Manx turns up, but that information is not sufficient for my needs. Alternatively, if someone had the listings for either XXDP diagnostics ZMSDD0 or ZMSPC0, that would also likely solve the problems I'm encountering. As a teaser, here's SIMH simulating a /44 with 2 MS11-M (128kW) modules, non-interleaved: .R ZMSDD0 ZMSDD0.BIN CZMSDD - MS11L/M MEMORY DIAGNOSTIC 11/44 CACHE AVAILABLE FS COMMAND MODE COMMAND:99 COMMANDS AVAILABLE: 0 = EXIT 1 = READ CSR 2 = LOAD CSR 3 = EXAMINE MEMORY 4 = MODIFY MEMORY 5 = SELECT BANK & PATTERN 6 = TYPE CONFIG MAP 7 = SOB-A-LONG TEST 8 = ERROR SUMMARY 9= REFRESH TEST 10= SET FILL COUNT 11= ENTER KAMIKAZE MODE 12= EXIT KAMIKAZE MODE 13= TURN CACHE OFF 14= TURN CACHE ON 15= TEST SELECTED BANKS 16= TEST ALL BANKS 17= ENABLE TRACE 18= DISABLE TRACE COMMAND:11 ENTERING KAMIKAZE MODE COMMAND: LEAVING FS MODE 256K OF MS11-M 256K WORDS OF MEMORY TOTAL MEMORY CONFIGURATION MAP 16K WORD BANKS 1 2 3 4 5 6 7 012345670123456701234567012345670123456701234567012345670123 ERRORS CPU MAP 1111111111111111 INTRLV ---------------- MEMTYPE MMMMMMMMMMMMMMMM CSR 0000000011111111 PROTECT PP I END PASS # 1 END PASS # 2 Thanks, John