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
One-hour Mandelbrot: Creating a fractal on the vintage Xerox Alto
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I wrote a short program to generate the Mandelbrot set on the Xerox Alto, a groundbreaking minicomputer from the 1970s. The program, in...
12 comments:
1950's tax preparation: plugboard programming with an IBM 403 Accounting Machine
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Long before computers existed, businesses used electromechanical accounting machines for data processing. These one-ton accounting machines ...
17 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...
18 comments:
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