Motherboard

Someone Built a Working Four-Bit Computer Out of Cardboard and Marbles
Motherboard
Computers aren’t magic. Underneath your fingertips right now are wires and logic gates. Switches. A 1 becomes a 0; two 1s become a 1; a 1 and a 0 become a 0; a 1 and a 0 become a 1; two 0s become a 1. Simply, different sorts of gates take on/off

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