[Hm. This didn't crosspost when I posted it to cctech, so here it is again, addressed to cctalk. Sorry if you get this twice.] Well, I've finally moved from acquire mode into play mode. First, I'm trying to get this uPDP-11/23+ running. I've got so far as a BA23 with PSU, fans, backplane, front panel, RD52, and RX50 -- that seems to power up without any problems. Now I'm going to put the boards in, and I need help. Here's what I plan on doing: Backplane is H9278-A: slots 1-3 Q22/CD, slots 4-8 Q22/Q22. AAAAAAAAAA BBBBBBBBBB CCCCCCCCCC DDDDDDDDDD 1 M8189----(KDF11-BF)------------------------ 2 M9047---------------- 3 M9047---------------- 4 M8067-LB-(MSV11-P)------------------------- 5 M7957----(DZV11-M)------------------------- 6 M8639-YA-(RQDX1)--------------------------- 7 M9047---------------- M9047---------------- 8 M9047---------------- M9047---------------- The memory is in slot 4 because its grant continuity jumpers (W1 and W2) are soldered in, which (according to the MSV11-P user's guide) tells me it expects a Q22/Q22 slot instead of a Q22/CD slot. Question 1: does the above look OK, or have I got something wrong? Question 2: Should I try it first with just the CPU and memory in, just to get a boot prompt on the console? I'm subscribed to both lists, so feel free to reply to either one. -- Jeffrey Sharp The email address lists(a)subatomix.com is for mailing list traffic. Please send off-list mail to roach jay ess ess at wasp subatomix beetle dot com. You may need to remove some bugs first.