chuckle I got a chance to tour a CDC Cyber 205--one of the last in active use. And "tour" is the right word--we toured it like you'd tour a house. First and l

chuckle I got a chance to tour a CDC Cyber 205--one of the last in active use. And "tour" is the right word--we toured it like you'd tour a house. First and last computer I was ever...inside of. You'd go down this "hall", the walls full of millions of wires, carefully looped so that the signals wouldn't arrive too early (1 foot = 1 nanosecond, and you wanted all the signals of the bus to arrive at the same time, which meant the all the wires on the bus had to be the same length.) "There's the address bus, now down the hall there are two rooms, one is the ALU, the other is the optional square root calculating units.... Yeah, a whole "room" to calculate square roots. I guess they hadn't figured out the fast square root algorithm which DOOM used yet :-) Absolutely astounding artifact. It was like seeing the great pyramids.