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audio fixes for overdrive demo

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This commit is contained in:
kub 2020-01-26 20:12:18 +01:00
parent 43e1401008
commit 7aab476859
5 changed files with 15 additions and 11 deletions
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8
pico/memory.c
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@ -733,8 +733,10 @@ static void PicoWrite8_vdp(u32 a, u32 d)
static void PicoWrite16_vdp(u32 a, u32 d)
{
if ((a & 0x00f9) == 0x0010) // PSG Sound
if ((a & 0x00f9) == 0x0010) { // PSG Sound
psg_write_68k(d);
return;
}
if ((a & 0x00e0) == 0x0000) {
PicoVideoWrite(a, d);
return;
@ -898,10 +900,10 @@ void ym2612_sync_timers(int z80_cycles, int mode_old, int mode_new)
int xcycles = z80_cycles << 8;
/* check for overflows */
if ((mode_old & 4) && xcycles > Pico.t.timer_a_next_oflow)
if ((mode_old & 4) && xcycles >= Pico.t.timer_a_next_oflow)
ym2612.OPN.ST.status |= 1;
if ((mode_old & 8) && xcycles > Pico.t.timer_b_next_oflow)
if ((mode_old & 8) && xcycles >= Pico.t.timer_b_next_oflow)
ym2612.OPN.ST.status |= 2;
/* update timer a */