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I only found one thing relavant to my question, and it says that IRQ 12 (interrupt 74h) is called by the mouse
hardware after each movement, button press, etc... I wrote a ISR to intercept IRQ 12, whipped-up some code to
modify the vector table, and it was never called by the mouse. Am I forgetting something? Is there a bit-flag in
some port that I need to modify?