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A deep-dive blog post reverse-engineering a 1948 IBM 604 vacuum-tube flip-flop module, explaining its circuitry and demonstrating it in operation.
A detailed teardown and live demonstration of a TR-3 vacuum-tube trigger/flip-flop module from IBM's 1948 Electronic Calculating Punch, explaining its circuitry and historical significance.
The article discusses powering up a thyratron tube module from the 1948 IBM 604 Electronic Calculating Punch, detailing the historical context of early electronic computing and the innovation of pluggable modules.