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nes, fix Darkwing Duck (T-Chi) gfx corruption in map screen

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This commit is contained in:
dinkc64 2020-11-19 23:08:15 -05:00
parent 50d5c07deb
commit d4004fd471
1 changed files with 10 additions and 2 deletions
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12
src/burn/drv/nes/d_nes.cpp
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@ -48,6 +48,7 @@ static UINT32 FDSFrameDiskIcon;
static UINT32 NESMode = 0;
#define NO_WORKRAM 0x0001 // 6000-7fff reads data openbus
#define BUS_CONFLICTS 0x0002 // rom conflicts with writes, needs special handling
#define ALT_MMC3 0x0004 // alternate mmc3 scanline timing
#define USE_4SCORE 0x0100 // 4-Player device (NES)
#define USE_HORI4P 0x0200 // 4-Player device Mode 2 (Famicom)
#define USE_ZAPPER 0x0400 // Zapper Gun device
@ -591,6 +592,7 @@ static INT32 cartridge_load(UINT8* ROMData, UINT32 ROMSize, UINT32 ROMCRC)
NESMode |= (ROMCRC == 0xb90a1ca1) ? NO_WORKRAM : 0; // Low G Man
NESMode |= (ROMCRC == 0xa905cc12) ? NO_WORKRAM : 0; // Bill & Ted
NESMode |= (ROMCRC == 0xd2f19ba1) ? NO_WORKRAM : 0; // Haradius Zero
NESMode |= (ROMCRC == 0x585f3500) ? ALT_MMC3 : 0; // Darkwing Duck (T-Chi)
NESMode |= (ROMCRC == 0x560142bc) ? ALT_TIMING2 : 0; // don doko don 2
NESMode |= (ROMCRC == 0x3616c7dd) ? ALT_TIMING : 0; // days of thunder
NESMode |= (ROMCRC == 0xeb506bf9) ? ALT_TIMING : 0; // star wars
@ -2728,6 +2730,10 @@ static UINT8 *mmc5_mask; // mmc3/mmc5 ppumask-sniffer // 0x18 = rendering
static void mapper04_scanline()
{
if (NESMode & ALT_MMC3 && (mmc5_mask[0] & 0x18) == 0x00) {
return;
}
INT32 cnt = mapper4_irqcount;
if (mapper4_irqcount == 0 || mapper4_irqreload) {
mapper4_irqreload = 0;
@ -2737,7 +2743,7 @@ static void mapper04_scanline()
}
if (cnt && mapper4_irqenable && mapper4_irqcount == 0) {
if (mmc5_mask[0] & 0x18) { // aka if (RENDERING)
if ((~NESMode & ALT_MMC3 && mmc5_mask[0] & 0x18) || NESMode & ALT_MMC3) { // aka if (RENDERING)
M6502SetIRQLine(0, CPU_IRQSTATUS_ACK);
}
}
@ -8364,7 +8370,9 @@ static void ppu_scan(INT32 nAction)
static void ppu_reset()
{
mmc5_nt_ram = &nt_ram[0];
scanline = 240;
// start at (around) vblank to remove 1 full frame of input lag
scanline = 239; // line on titlescreen of micromachines if starts on 240
pixel = 0;
ppu_frame = 0;