In search of Three Rivers PERQ 1 Keyboard

On Thu, Apr 30, 2020 at 6:40 AM Tony Duell <ard.p850ug1 at gmail.com> wrote: Digging around, I have found : A hand-drawn schematic that I reverse-engineered of the keyboard PCB instelf A .tar.gz file of PERQ PROMs/PALs. Most relate to the PREQ2 machines (there's even a dump of the AMUX24 PROM for the 24 bit T4 CPU board). But the PERQ1 keyboard mapping PROM is there. I couldn't find a diagram of the keyboard cable so I took my PERQ1 keyboard apart and traced it out. I am happy to provide copies of the above to anyone who wants them. You'd be welcome to distribute them further. As I have a limited data quota each month, in fact I'd rather send them out once and let somebody else pass them around. I do not recommend trying to copy the original keyboard though. I susepct the encoder IC is totally unobtainable now. Note that some PERQ backplane ('MOM') diagrams have an error on the keyboard connector pinout, the signal to increment the DDS (diagnostic display) doesn't appear there. My cable diagram shows it though. The DDS diagram should be on bitsavers. -tony