Like other early, low-cost PDP-11s, it did not support either memory management of any kind, or hardware floating point, EIS instructions, or the various instructions added to the PDP-11 instruction set (XOR, SOB, SXT and MARK).
There is a lack of clarity over the RTT instruction; the pdp11 04/05/10/35/40/45 processor handbook says it is not implemented, but the PDP-11 Architecture Handbook says "available in 11/04 but is different from other implementations"; the KD11-D Processor Manual (EK-KD11D-TM-PRE) says the "first instruction after RTT is guaranteed to be executed" - the same as the KD11-A CPU.
The microcode diagnostic interface to the KY11-LB is carried over a 10-wire flat cable connected to the J2 Berg connector header on the KY11-LB's M7859 module (the other 10-pin header on that card is unused with the -11/04), and a set of vertical pins in the upper left-hand corner (see image above) of the M7263. (The main functionality of the KY11-B is done over the UNIBUS, and a pair of backplane lines.)
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Clones: CM 1420