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There were two programming methods in general use, a specific computer would use only one of them:

Patch cable and switchesSimilar to an old telephone operator board, you had a panel with lots of holes and cables you could use to connect the holes. The pattern of connections defined the program.

Punched paper tapeYou could punch holes in a paper tape to represent the program, and feed it to the computer. The computer had a paper tape reader, and wrote the result to a printer.

By the late 1940s computers could even store the program internally, so you didn't have to run the paper tape through it for every calculation.


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15y ago

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