On 07/05/2012 02:22 AM, Boyanich, Alastair wrote: Quick question. I've just snaffled an M8190-AE with what I think is the 21-21853-06 FPU as an upgrade for either the 11/70 or 11/23Plus at home. Nice! I've seen reference to CIS microcode for these boards about the place and am extremely keen to have a go at it with macro. I'm not "actually" sure if it has it in the PROMS, but being handy with a EPROM programmer hopefully I can find it. Does anyone have any reading material on how to figure out if the CIS microcode is installed ? 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. -Dave -- Dave McGuire, AK4HZ New Kensington, PA