On Fri, Oct 2, 2026 at 4:56 PM Paul Koning via cctalk <[email protected]> wrote: > > On Oct 2, 2026, at 4:38 PM, Martin Eberhard via cctalk > > <[email protected]> wrote: > > I just finished scanning the DEC documentation for the KH11-A "NPR > > Expansion" option for the PDP11/20 and the PDP11/05 machines. (I just > > bought this drawing set on eBay...)
Very nice! I know we've talked about the KH11-A before. > Wow. I've never heard of this. The O/M list shows it as a regular product, > not a CSS special which was my first guess. I wonder how many they actually > sold. My dismantled 11/20 that I saved from a literal dumpster has it. I don't know a lot about the machine except that some time prior to 1984 it was purchased from Ohio State University Surplus, probably the original buyer. It had 2 BA11-M memory boxes and seven 4K stacks, a KE11-A math unit, and an RK11-C. No other interesting peripherals by the time it ended up at Surplus. -ethan
