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audio: improve cycle accuracy of SN76496+YM2612

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This commit is contained in:
kub 2020-04-22 20:41:51 +02:00
parent 6432fb18ba
commit 09b96f9940
4 changed files with 32 additions and 56 deletions
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7
pico/memory.c
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@ -391,7 +391,7 @@ static int get_scanline(int is_from_z80);
static void psg_write_68k(u32 d)
{
// look for volume write and update if needed
if ((d & 0x90) == 0x90 && Pico.snd.psg_line < Pico.m.scanline)
if ((d & 0x90) == 0x90)
PsndDoPSG(Pico.m.scanline);
SN76496Write(d);
@ -401,8 +401,7 @@ static void psg_write_z80(u32 d)
{
if ((d & 0x90) == 0x90) {
int scanline = get_scanline(1);
if (Pico.snd.psg_line < scanline)
PsndDoPSG(scanline);
PsndDoPSG(scanline);
}
SN76496Write(d);
@ -1061,7 +1060,7 @@ static int ym2612_write_local(u32 a, u32 d, int is_from_z80)
if (PicoIn.opt & POPT_EXT_FM)
return YM2612Write_940(a, d, get_scanline(is_from_z80));
#endif
PsndDoFM(get_scanline(is_from_z80));
PsndDoFM(is_from_z80 ? z80_cyclesDone() : z80_cycles_from_68k());
return YM2612Write_(a, d);
}