Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Showing posts with label
ibm1401
.
Show all posts
Showing posts with label
ibm1401
.
Show all posts
Christmas shopping the IBM way: computerized gift selection in 1962
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In 1962, the Simpson's department store in Toronto used an IBM computer to help customers select Christmas gifts, based on the charact...
3 comments:
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...
6 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...
19 comments:
Risky line printer music on a vintage IBM mainframe
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At the Computer History Museum , we recently obtained card decks for a 50-year-old computer music program. Back then, most computers didn&#...
4 comments:
Accounting machines, the IBM 1403, and why printers standardized on 132 columns
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Have you ever wondered why 132 characters is such a common width for printers? Many printers produced lines of 132 characters, such as the g...
11 comments:
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