Keyboard: Problem with the (re)programmed Interrupt handler

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Rob

Re:Keyboard: Problem with the (re)programmed Interrupt handl

Post by Rob »

That is a "standard" method to detect if something is zero or not. Remember that the processor sets flags on instructions like test.

So, test eax, eax will set the zero flag if eax is zero and otherwise it won't.

test eax, eax
jz NullPointer

That jz will be taken if eax = 0, otherwise the jump will not be taken
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