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mos6522: remove additional interrupt flag filter from mos6522_update_irq()

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The datasheet indicates that the interrupt is generated by ANDing the
interrupt flags register (IFR) with the interrupt enable register (IER)
but currently there is an extra filter for the SR and timer interrupts.

Remove this extra filter to allow interrupts to be generated by external
inputs on bits 1 and 2 of ports A and B.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Mark Cave-Ayland 2018-06-13 09:30:14 +01:00 committed by David Gibson
parent 7f5d6517e3
commit 32a8c27b5d
1 changed files with 1 additions and 1 deletions
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hw/misc/mos6522.c
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@ -40,7 +40,7 @@ static void mos6522_timer_update(MOS6522State *s, MOS6522Timer *ti,
static void mos6522_update_irq(MOS6522State *s)
{
if (s->ifr & s->ier & (SR_INT | T1_INT | T2_INT)) {
if (s->ifr & s->ier) {
qemu_irq_raise(s->irq);
} else {
qemu_irq_lower(s->irq);