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core, improve 68K/Z80 timing

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This commit is contained in:
kub 2023-04-24 23:50:06 +02:00
parent ae9a76c90d
commit 133006a9d4
3 changed files with 20 additions and 11 deletions
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13
pico/memory.c
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@ -325,7 +325,7 @@ static NOINLINE u32 port_read(int i)
out = data_reg & ctrl_reg;
// pull-ups: should be 0x7f, but Decap Attack has a bug where it temp.
// disables output before doing TH-low read, so don't emulate it for TH.
// disables output before doing TH-low read, so emulate RC filter for TH.
// Decap Attack reportedly doesn't work on Nomad but works on must
// other MD revisions (different pull-up strength?).
u32 mask = 0x3f;
@ -599,9 +599,10 @@ static u32 PicoRead8_z80(u32 a)
return 0;
}
if ((a & 0x4000) == 0x0000)
if ((a & 0x4000) == 0x0000) {
SekCyclesBurnRun(1);
d = PicoMem.zram[a & 0x1fff];
else if ((a & 0x6000) == 0x4000) // 0x4000-0x5fff
} else if ((a & 0x6000) == 0x4000) // 0x4000-0x5fff
d = ym2612_read_local_68k();
else
elprintf(EL_UIO|EL_ANOMALY, "68k bad read [%06x] @%06x", a, SekPc);
@ -623,6 +624,7 @@ static void PicoWrite8_z80(u32 a, u32 d)
}
if ((a & 0x4000) == 0x0000) { // z80 RAM
SekCyclesBurnRun(1);
PicoMem.zram[a & 0x1fff] = (u8)d;
return;
}
@ -1269,9 +1271,10 @@ void PicoWrite16_32x(u32 a, u32 d) {}
static unsigned char z80_md_vdp_read(unsigned short a)
{
z80_subCLeft(2);
if ((a & 0xff00) == 0x7f00) {
z80_subCLeft(3);
Pico.t.z80_buscycles += 7;
if ((a & 0x00f0) == 0x0000) {
switch (a & 0x0d)
{
case 0x00: return PicoVideoRead8DataH(1);