Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Showing posts with label
reverse-engineering
.
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Showing posts with label
reverse-engineering
.
Show all posts
IBM mainframe tube module part II: Powering up and using a 1950s key debouncer
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In the 1950s, before integrated circuits or even transistors, mainframe computers were built from thousands of power-hungry vacuum tubes fil...
5 comments:
An 8-tube module from a 1954 IBM mainframe examined: it's a key debouncer
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IBM's vacuum tube computers of the 1950s were built from pluggable modules, each holding eight tubes and the associated components. I re...
15 comments:
Decoding an air conditioner control's checksum with differential cryptanalysis
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Back in 2009 I wrote an Arduino library ( IRRemote ) to encode and decode infrared signals for remote controls. I got an email recently fr...
8 comments:
Examining a vintage RAM chip, I find a counterfeit with an entirely different die inside
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A die photo of a vintage 64-bit TTL RAM chip came up on Twitter recently, but the more I examined the photo the more puzzled I became. The c...
27 comments:
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