Domino computer
Realizes: boolean logic (AND, OR, NOT)
Standing dominoes propagate a falling signal. Fan-outs split signals, and careful geometry implements AND and OR gates. Signal is one-shot — must reset by standing dominoes again. Speed: ~1 domino per second propagation (~10-50 seconds total). Capacity: single boolean expression evaluation (one-shot).
Examples
Matt Parker — domino binary adder
AND
OR
NOT
seconds
single-op
mJ