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I don't get it😭😭
This video might help. Basically, a PS/2 keyboard works by sending an interrupt to the CPU, which gives it the scan code for the key pressed
Look up 'CPU Interrupts' :)
I think it's about IO interrupts?
https://www.geeksforgeeks.org/interrupts-in-8086-microprocessor/
I think it was funny in the 80's