Retro/pcem
Watch
1
0
Fork
You've already forked pcem
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

PIC clears pending flag when acknowledging interrupt.

Browse source 
PIT latch mode works correctly.
Fixes 'High Performance PC' mode in Lemmings.
This commit is contained in:
TomW 2015-09-12 14:57:14 +01:00
commit 5260f5f5cd
2 changed files with 17 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

1
src/pic.c
View file

@ -110,6 +110,7 @@ void pic_write(uint16_t addr, uint8_t val, void *priv)
if (pic.ins&(1<<c))
{
pic.ins&=~(1<<c);
pic.pend &= ~(1 << c);
pic_update_mask(&pic.mask2, pic.ins);
if (c == 2 && (pic2.pend&~pic2.mask)&~pic2.mask2)

17
src/pit.c
View file

@ -259,6 +259,21 @@ static void pit_over(int t)
pit.running[t] = pit.enabled[t] && pit.using_timer[t];
}
int pit_get_timer_0()
{
int read = (int)((pit.c[0] + ((1 << TIMER_SHIFT) - 1)) / PITCONST) >> TIMER_SHIFT;
//pclog("pit_get_timer_0: t=%i using_timer=%i m=%i\n", 0, pit.using_timer[0], pit.m[0]);
if (pit.m[0] == 2)
read++;
if (read < 0)
read = 0;
if (read > 0x10000)
read = 0x10000;
if (pit.m[0] == 3)
read <<= 1;
return read;
}
static int pit_read_timer(int t)
{
timer_clock();
@ -333,7 +348,7 @@ void pit_write(uint16_t addr, uint8_t val, void *priv)
pit.rm[val>>6]=3;
pit.rl[t] = pit_read_timer(t);
}
pit.rereadlatch[val>>6]=1;
// pit.rereadlatch[val>>6]=1;
if ((val>>6)==2) ppispeakon=speakon=(pit.m[2]==0)?0:1;
pit.initial[t] = 1;
if (!pit.m[val >> 6])