1 6522 Via. If that a person is not the just one that brought on the interrupt, test the next Via. That suggests that to feed much more than one WDC W65C22S's IRQ output into the processor's IRQ enter, you may will need an AND gate arrangement, so that if any 1 of the IRQ's goes reduced, the processor's IRQ enter is taken minimal. The INC instruction increments the memory area devoid of transforming A, X, or Y.