G'day Dave, Nice! Thanks, Yeah I was more than a bit hot for it also. Looks like it came out of Ford Aerospace and Comms Corp (P.S. FAAC Best acronym next to our old one of FACOM which was changed when someone heard a .jp accent saying "FAKKUM" to one of the clients *G*). No clue how it ended up in Adelaide unless they were doing defence contracting. Huh? That's a J-11 based board, and I'm pretty sure the CIS option for the J-11, while planned, was never actually shipped. It would have been two additional chip carriers on the bottom side of the big white J11 multi-carrier chip. The only ROMs on a KDJ11-Bx board contain the boot/diag code, not microcode, and conversely, the only microcode on a KDJ11-Bx (or any J11-based board for that matter) is in the microcode ROM, which is a part of the "control" chip, which is one the two chips on the J11 multi-chip carrier itself. No microaddress lines or any other internal state machine stuff is brought out to the pins of a J11. (sorry!) You CAN, however, get a CIS option (if you can find it!) for your 11/23! I too would love to mess with CIS a bit; I've never done so. I have two CIS option board sets for my 11/44s but have not yet installed them. Nice! (tm) .. got a photo's of the 11/44 option? Really wondering about the /23Plus. If the option for it is just PROM's that should be pretty easy to reproduce. Al.