Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Understanding silicon circuits: inside the ubiquitous 741 op amp
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The 741 op amp is one of the most famous and popular ICs [1] with hundreds of millions sold since its invention in 1968 by famous IC des...
22 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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