this post was submitted on 14 May 2026
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It moves the value of register (a CPU memory cell) rbx to register rax. It's not that important though.
Basically the comic shows that the CPU is happily chugging along, executing instructions when suddenly the keyboard sends an interrupt telling the CPU it must stop all work and listen to whatever it has to say.
That was how keyboards worked before USB (back when they used PS/2 or DIN connectors). With USB it's the other way around: the device gets polled X times per second to check of it has any data to send.
Iirc the south bridge now aggregates masked interrupts and groups them together instead of pestering the CPU a whole bunch