New answers tagged interrupt
1
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Chaining IRQs in x86 ROM code
Alternative method: Store an EAh opcode (jmp far immediate) in front of the doubleword holding your downlink. When setting up the interrupt handler use mov byte [INT_08_OLD - 1], 0EAh. To chain, do ...
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3
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Chaining IRQs in x86 ROM code
Here's the full interrupt handler of my example, except for the business logic of actually handling the count. INT_08_OLD is assumed to be an offset in segment 40h. I'm writing in NASM syntax.
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