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Microsoft Just Released MS-DOS Source Code! (github.com)

submitted 6 months ago by pastermil@sh.itjust.works to c/opensource@lemmy.ml

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[-] PowerCrazy@lemmy.ml 23 points 6 months ago

Where is the ctrl+alt+del function defined? I just want to see what made that sequence work. I'd also be interested in where ctrl+break is defined.

[-] mkwt@lemmy.world 36 points 6 months ago

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.

[-] billgamesh@lemmy.ml 2 points 6 months ago

is it in the source code, or is it just passed right to BIOS?

[-] uid0gid0@lemmy.world 5 points 6 months ago* (last edited 6 months ago)

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