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Programmable digital computers have never worked without software (or firmware). Even ENIAC used a form of firmware to work, it had to have programs wired into it by hand from 1945 to 1948, then from 1948 on software was loaded by manually setting hundreds of rotary switches.

All modern computers can only do one thing without software: start a preloaded bootstrap program running. The bootstrap program is a piece of software (or firmware) that tells the computer how to set itself up, find the OS software, and start the OS software running. This preloaded bootstrap program is either entered manually by the operator at turnon (very rare anymore) or resides as firmware in a ROM loaded at the factory.

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Q: How did computers work without software?
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