On Sun, 2011-02-27 at 10:48 -0800, John R Pierce wrote: > the PDP-10 was in fact considered a mainframe in the 1960s. They were > more commonly called DECsystem-10, or KA10, KL10. the CPU was multiple > cabinets, the KL10 supported up to 4 megawords of ram (where a word was > 36 bits). They were commonly used as timesharing systems which was > relatively uncommon in the late 1960s What type of memory did it have? At my second computer job in 1967 on a Honeywell H-120 (a baby machine with 3 tapes which took 1 hour to do a Cobol compilation ... and then another hour for a recompile to correct the 400 errors the Punch Room had mysteriously added to 'verified' coding sheets) the memory was magnetic cores using 3 wires physically through each hollow core or ring. The memory total was, I think, octal 37777. I can still read punch cards held upto the light to see where the holes are :-) -- With best regards, Paul. England, EU.