DEC got it's official start making their own versions of these (well, from the TX-2 computer a couple of the founders worked on as graduate students): https://e

DEC got it's official start making their own versions of these (well, from the TX-2 computer a couple of the founders worked on as graduate students): https://en.wikipedia.org/wiki/Digital_Equipment_Corporation#Origins https://en.wikipedia.org/wiki/Digital_Equipment_Corporation#... So many computer companies had gone bust by then that, per their own observations and the advice of the legendary Georges Doriot, "the father of venture capitalism", they changed their business plan to doing that first, and if they got enough business, to then do a computer with them. Hence the names "Digital Equipment Corporation" and "Programmed Data Processor", no "computers" here. Or indeed no mainframes or 1401 class machines. Heh, per the Wikipedia article, they sold a lot of these to other computer companies who used them to test their own stuff. I suppose it doesn't necessarily hurt to sell shovels while you do your own gold mining. And, yeah, I remember these IBM modules. I obtained an decimal addressed (units 0-9) very fast, like 124 inches per second 7 track IBM tape drive for a computer center. It was filled with these boring, beige cards, DEC's looked much better ^_^. Hmmm, and the PDP-6 was a ... less than stellar success because it's CPU wasn't made with these in the old fashioned way and was very hard to maintain (see this PC board: http://ljkrakauer.com/LJK/essays/pdp6plaque.jpg http://ljkrakauer.com/LJK/essays/pdp6plaque.jpg). Something they corrected with the first PDP-10, the KA-10, which used diode-transistor logic and huge wire wrapped backplanes.