I dug up a couple more spare PDP-11 references. These are both small "paperback" books: MICRO/PDP-11 Handbook, 1983-1984. EB 24944 18/83. Microsystems Handbook (1985). EB 26085-41/85 04 04/43. I'd give priority on a trade for a "recent" (~1985-86) Unibus peripherals handbook (for 11/24, 11/44, 11/84 peripherals). But let me know even if you don't have anything to trade. Dave Jenner djenner(a)halcyon.com