@BoscoMac Either one of the input buffers or a adress Decodes is stuck high. fairly common problem for that generation. Does the 3455A answer at all addresses?
@craig1black You can use something like KE5FX binary transfer to transfer a HPGL file to it in win, but thats about it, the only driver I know for Windows is 16 bit
@kenshirriff@astrobiology@SpaceRef Could they be doing it the old fasion way? Doping with Aasenic and boron while doing the Tanenbaum method and binding it together Kilby style?