The first electronic minds — from vacuum tubes to stored programs (1942–1951)
Before silicon chips and cloud servers, computing began with rotating drums of capacitors, rooms full of glowing vacuum tubes, and mercury pulsing through glass delay lines. These seven machines mark the transition from mechanical calculation to electronic computation — the decade that changed everything. Patch cables, toggle bits on a CRT, and watch signals propagate through the ancestors of every device you use today.
The first electronic computing machines — built in wartime urgency, they proved that electronics could calculate faster than any human or mechanical device.
The first automatic electronic digital computer. Watch the rotating capacitor drums store binary numbers and solve linear equations by Gaussian elimination.
The 51-foot electromechanical giant. Enter instructions on paper tape, watch relays click across 72 accumulators, and discover the origin of the word “bug.”
17,468 vacuum tubes filling a 30-ton room. Patch cables between function units, set digit switches, and watch tubes glow as ENIAC computes artillery trajectories.
The breakthrough insight: store the program in memory alongside the data. No more rewiring — just change the instructions in memory and run again.
The first stored-program computer. Toggle individual bits on a Williams tube CRT display and watch the fetch-decode-execute cycle animate in real time.
The first practical stored-program computer. Write programs in single-letter mnemonics, load them into mercury delay line memory, and step through execution.
From laboratories to offices — the first computers built not just for science, but for business and governance.
The first commercial computer. Re-enact the famous 1952 election night when UNIVAC predicted Eisenhower’s landslide — and CBS refused to believe it.
The world’s first business computer — built by a tea company. Run bakery delivery valuations and watch LEO compute optimal routes and print invoices.