IBM 604 vacuum Tube
The IBM 604 programmable electronic calculator used about 1400 of these electron tubes and 125 relays, its weight exceeding 600 kilograms.
Instead of using a keyboard and a screen, the input and output took place via punch cards. It only performed the 4 operations!
These plug-in modules had various functions including, Flip-Flop (memory), inverter (converted 0 to 1 and 1 to 0), set of 4 diodes to be used if necessary (they simulated a logic gate).
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