Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Germanium transistors: logic circuits in the IBM 1401 computer
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How did computers implement logic gates in the 1950s? Computers were moving into the transistor age, but transistors were expensive so cir...
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Strange chip: Teardown of a vintage IBM token ring controller
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IBM used some unusual techniques in its integrated circuits, and one of the most visible is packaging them in square metal cans. I've ...
8 comments:
Booting the IBM 1401: How a 1959 punch-card computer loads a program
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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 req...
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