diff options
Diffstat (limited to 'hw/misc/mac_via.c')
| -rw-r--r-- | hw/misc/mac_via.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/hw/misc/mac_via.c b/hw/misc/mac_via.c index d8b35e6ca6..525e38ce93 100644 --- a/hw/misc/mac_via.c +++ b/hw/misc/mac_via.c @@ -327,7 +327,9 @@ static void via1_sixty_hz(void *opaque) MOS6522State *s = MOS6522(v1s); qemu_irq irq = qdev_get_gpio_in(DEVICE(s), VIA1_IRQ_60HZ_BIT); - qemu_set_irq(irq, 1); + /* Negative edge trigger */ + qemu_irq_lower(irq); + qemu_irq_raise(irq); via1_sixty_hz_update(v1s); } @@ -338,7 +340,9 @@ static void via1_one_second(void *opaque) MOS6522State *s = MOS6522(v1s); qemu_irq irq = qdev_get_gpio_in(DEVICE(s), VIA1_IRQ_ONE_SECOND_BIT); - qemu_set_irq(irq, 1); + /* Negative edge trigger */ + qemu_irq_lower(irq); + qemu_irq_raise(irq); via1_one_second_update(v1s); } @@ -917,9 +921,11 @@ static uint64_t mos6522_q800_via2_read(void *opaque, hwaddr addr, unsigned size) * On a Q800 an emulated VIA2 is integrated into the onboard logic. The * expectation of most OSs is that the DRQ bit is live, rather than * latched as it would be on a real VIA so do the same here. + * + * Note: DRQ is negative edge triggered */ val &= ~VIA2_IRQ_SCSI_DATA; - val |= (ms->last_irq_levels & VIA2_IRQ_SCSI_DATA); + val |= (~ms->last_irq_levels & VIA2_IRQ_SCSI_DATA); break; } @@ -1146,7 +1152,8 @@ static void via2_nubus_irq_request(void *opaque, int n, int level) s->a |= (1 << n); } - qemu_set_irq(irq, level); + /* Negative edge trigger */ + qemu_set_irq(irq, !level); } static void mos6522_q800_via2_init(Object *obj) |