[Depressing to have PDP-6 schematics cause we'll never see one go] I just finished printing that. :) I think I'll take the prints down to the Electronics department. "Hey, wanna build something Fun? Yeah, *LOTS* more fun than a code beeper..." Outside of money, what's to keep you from building one from the schematics? Nobody says you have to be 100% perfect, I'm sure you could modify here & there to make it usable to normal people... (Like normal power supplies, smaller parts, etc.) -------

In message <m0yRkcA-000IyLC@p850ug1>, ard(a)p850ug1.demon.co.uk writes: Well I might be able to help there. I'm not in a position to scan them and put them on the web at the moment, but I do happen to have a couple of DEC data books in my collection. One is ca '64 and called System Modules. It contains 1000, 4000 and 6000 series modules. The other book describes what are the earliest series of flip-chip modules I've seen. It's dated 2/65 and contains the R, B, W and A series modules. I downloaded the PDP-6 drawings, but never got them printed satisfactorily, but I seem to remember reference to the system modules. Could you make a list of which ones were used on the 6? If so, I'll try to give a description of each, and if need be, try to dig up a scanner and scan the relevant pages. Many of the example circuits in this databook (including both a serial and a parallel adder) use capacitive coupling. So I expect that these are likely the same designs used on the early machines. Brian L. Stuart