PS/2 ports?
this post was submitted on 23 May 2025
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I'm still mad they killed PS/2 on recent motherboards. So much for NKRO I guess.
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(13 replies)
Don't forget the xt/at port
I feel like I should understand this, but I don't.
This is x86 assembler. (Actually, looking at the register names, it's probably x86_64. On old school x86, they were named something like al, ah (8 bit), ax (16 bit), or eax (32 bit).) Back in the old days, when you pressed a key on the keyboard, the keyboard controller would generate a hardware interrupt, which, unless masked, would immediately make the CPU jump to a registered interrupt handler, interrupting whatever else it was doing at the point. That interrupt handler would then usually save all registers on the stack, communicate with the keyboard controller to figure out what exactly happened, react to that, restore the old registers again and then jump back to where the CPU was before.
In modern times, USB keyboards are periodically actively polled instead.
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(17 replies)
The small bird is a CPU executing its instructions. The big bird is a keyboard sending an interrupt for the CPU to process immediately.
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(1 replies)
And their interrupt routine has an error that leads to changed memory and you donβt know why your Programm calculates β2+6=Eβ and that only sometimes on every other run.