Occasionally, the list of things I really should be working on gets a little overwhelming. Late last night was one of those times. So, I spent a couple hours playing with the pile of PDP-11 parts...

Took the BA-11N apart far enough to extract the backplane, and added the wires necessary to support 22-bit addressing. Put everything back together, and had a bit of a scare since I couldn't seem to get the console talking to me again. Found a problem in my serial cabling, after which all was well.

Dug the DELQA out of the stack, stuck it in the chassis below the KDJ11-D/S, and confirmed that the Decserver 550 firmware still in the CPU board was able to discover it.

Extracted the CQD-223/TM SCSI board from the s-box front panel it came in, and realized it's not going to fit into the slot spacing of the BA11-N as-is. The problem is that the 50-pin header for the drive cable is straight, so by the time you put a cable on it the stack is too thick for a backplane slot. So, either I need to scare up a Qbus continuity card or something to let me skip a slot and give the card double height, or alternatively I can replace the 50-pin header with a right-angle box header and the card should fit...

At that point, I decided I'd made enough progress, and called it a night.