Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
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:
Bitcoin mining on a 55 year old IBM 1401 mainframe: 80 seconds per hash
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Could an IBM mainframe from the 1960s mine Bitcoin? The idea seemed crazy, so I decided to find out. I implemented the Bitcoin hash algorith...
36 comments:
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