So I was recently provided (thanks!) with a copy of the later rev of the PDP-11/24 Tech Manual (EK-11024-TM-003), which I have had scanned for a while now (waiting for a quite period on the list ;-), and is now available for upload here:
http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/EK-11024-TM-003.pdf (Bitsavers et al, please pick this up and distribute.) So it has an Appendix D, which described the -YA later rev of the CPU card (in which a bunch of gates were replaced with a couple of custom gate arrays. Does anyone have one of these? I'd love to get a photo of one, if so. Thanks! Noel