Luigi Ruffolo

  1. Booting the IBM 1401: How a 1959 punch-card computer loads a program

    02-24-2021 at 11:44 PM
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    «How do you boot a computer from punch cards when the computer has no operating system and no ROM? To make things worse, this computer requires special metadata called "word marks" that can't be represented on a card. In this blog post, I describe the interesting hardware and software ...
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