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
Inside card sorters: 1920s data processing with punched cards and relays
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Punched card sorters were a key part of data processing from 1890 until the 1970s, used for accounting, inventory, payroll and many other ...
5 comments:
Qui-binary arithmetic: how a 1960s IBM mainframe does math
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The IBM 1401 computer uses an unusual technique called qui-binary arithmetic to perform arithmetic. In the early 1960s, the IBM 1401 wa...
3 comments:
Fixing the core memory in a vintage IBM 1401 mainframe
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I recently had the chance to help fix one of the vintage IBM 1401 computer systems at the Computer History Museum when its core memory sta...
20 comments:
Examining the core memory module inside a vintage IBM 1401 mainframe
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The IBM 1401 mainframe computer was announced in 1959 and by the mid-1960s had become the best-selling computer , extremely popular with me...
6 comments:
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