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vdp, fix for 68k access timing

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This commit is contained in:
kub 2020-12-12 17:29:31 +01:00
parent 1613ec6c30
commit dda72beae4
3 changed files with 47 additions and 35 deletions
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4
pico/pico_cmn.c
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@ -178,13 +178,13 @@ static int PicoFrameHints(void)
}
pv->status |= SR_VB | PVS_VB2; // go into vblank
PicoVideoFIFOMode(pv->reg[1]&0x40, pv->reg[12]&1);
// the following SekRun is there for several reasons:
// there must be a delay after vblank bit is set and irq is asserted (Mazin Saga)
// also delay between F bit (bit 7) is set in SR and IRQ happens (Ex-Mutants)
// also delay between last H-int and V-int (Golden Axe 3)
Pico.t.m68c_line_start = Pico.t.m68c_aim;
PicoVideoFIFOMode(pv->reg[1]&0x40, pv->reg[12]&1);
do_timing_hacks_start(pv);
CPUS_RUN(CYCLES_M68K_VINT_LAG);
@ -270,7 +270,6 @@ static int PicoFrameHints(void)
pv->status &= ~(SR_VB | PVS_VB2);
pv->status |= ((pv->reg[1] >> 3) ^ SR_VB) & SR_VB; // forced blanking
PicoVideoFIFOMode(pv->reg[1]&0x40, pv->reg[12]&1);
// last scanline
Pico.m.scanline = y++;
@ -289,6 +288,7 @@ static int PicoFrameHints(void)
// Run scanline:
Pico.t.m68c_line_start = Pico.t.m68c_aim;
PicoVideoFIFOMode(pv->reg[1]&0x40, pv->reg[12]&1);
do_timing_hacks_start(pv);
CPUS_RUN(CYCLES_M68K_LINE);
do_timing_hacks_end(pv);