That's what we're here for... :-) No. The KDF11-B of the 23+: http://gunkies.org/wiki/KDF11-B_CPU is the same CPU as all the other KDF11 CPUs; it just has a couple of extra peripherals on the board (2 asyn serial lines, and some PROMs, IIRC). Like all KDF11 CPUs, it has a socket for an MMU chip, but the chip may or may not be there (I don't know if it was standard on the 23+; and in any event, it may have been pulled - the CPU will work without it). The main CPU is a DIP carrier which holds two chips; the optional KTF11-A MMU has one (see the image, above); the optional KEF11-A FPU is also a carrier with two chips. (The KDF11-B can also hold the large 6-chip carrier of the optional KEF11-B CIS chip - a rara avid indeed, if you'relucky enough to have it.) If yours doesn't have the MMU chip, you're probably SOL; those are very rare. KEF11-A FPU chips are avilable on eBay for modest amounts. None of the KDF11 CPUs support splite I/D. Noel