When I was in tech. school, I programed an analog computer. It was
basically an op-amp made out of vacuum tubes. It could only add,
subtract, multiply and divide, and was "programed" by resistors. The
result was read on an analog voltmeter.

It was kept undercover in the corner of the digital lab, and was only
unveiled when a smart alex student asked a question or made a comment
about "why aren't there any analog computers?"

It's design was based on the Army's targeting/trajector computer of
W.W.II, which I believe was called EMAC? IIRC, EMAC was the size of a
house. 

Darryl Gibson
Linux Neophyte (tm)
RLU # 182668
This computer is 100% Microsoft FREE

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