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The PIC timer is no longer used to latch all IRQ updates on XT, but only those after writes to the mask register, which are now delayed for the duration of 1 CPU cycles, making the PCjr boot again, fixes #3500.

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OBattler
2023-08-08 03:52:09 +02:00
parent d6b7619878
commit b4aea2f768
1 changed files with 6 additions and 12 deletions
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18
src/pic.c
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@@ -225,12 +225,7 @@ find_best_interrupt(pic_t *dev)
static __inline void
pic_update_pending_xt(void)
{
if (find_best_interrupt(&pic) != -1) {
latched++;
if (latched == 1)
timer_on_auto(&pic_timer, 0.35);
} else if (latched == 0)
pic.int_pending = 0;
pic.int_pending = (find_best_interrupt(&pic) != -1);
}
static __inline void
@@ -248,11 +243,7 @@ pic_callback(void *priv)
{
pic_t *dev = (pic_t *) priv;
dev->int_pending = 1;
latched--;
if (latched > 0)
timer_on_auto(&pic_timer, 0.35);
update_pending();
}
void
@@ -501,7 +492,10 @@ pic_write(uint16_t addr, uint8_t val, void *priv)
break;
case STATE_NONE:
dev->imr = val;
update_pending();
if (is286)
update_pending();
else
timer_on_auto(&pic_timer, .0 * ((10000000.0 * (double) xt_cpu_multi) / (double) cpu_s->rspeed));
break;
default: