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Microsoft Just Released MS-DOS Source Code!
(github.com)
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this post was submitted on 26 Apr 2024
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Ctrl+alt+delete was a separate interrupt line direct from the keyboard. That is, when you pressed the three keys, the interrupt signal was asserted, causing the CPU to jump to the interrupt service routine, which should be in the source code package.
is it in the source code, or is it just passed right to BIOS?
It was originally a BIOS interrupt, but eventually got captured by the OS. Here's Dave Bradley talking about inventing it https://m.youtube.com/watch?v=K_lg7w8gAXQ