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Add UNROM modes and two-chip variant to mapper 242

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NewRisingSun
2021-11-13 23:15:13 +01:00
parent b72007fa62
commit a4586e0aee
1 changed files with 52 additions and 3 deletions
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55
src/boards/addrlatch.c
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@@ -495,15 +495,64 @@ void Mapper231_Init(CartInfo *info) {
}
/*------------------ Map 242 ---------------------------*/
static uint8 M242TwoChips;
static void M242Sync(void) {
uint32 S = latche & 1;
uint32 p = (latche >> 2) & 0x1F;
uint32 L = (latche >> 9) & 1;
if (M242TwoChips) {
if (latche &0x600)
{ /* First chip */
p &= 0x1F;
}
else
{ /* Second chip */
p &= 0x07;
p += 0x20;
}
}
if ((latche >> 7) & 1) {
if (S) {
setprg32(0x8000, p >> 1);
} else {
setprg16(0x8000, p);
setprg16(0xC000, p);
}
} else {
if (S) {
if (L) {
setprg16(0x8000, p & 0x3E);
setprg16(0xC000, p | 7);
} else {
setprg16(0x8000, p & 0x3E);
setprg16(0xC000, p & 0x38);
}
} else {
if (L) {
setprg16(0x8000, p);
setprg16(0xC000, p | 7);
} else {
setprg16(0x8000, p);
setprg16(0xC000, p & 0x38);
}
}
}
if (!hasBattery && (latche & 0x80) == 0x80)
/* CHR-RAM write protect hack, needed for some multicarts */
SetupCartCHRMapping(0, CHRptr[0], 0x2000, 0);
else
SetupCartCHRMapping(0, CHRptr[0], 0x2000, 1);
setmirror(((latche >> 1) & 1) ^ 1);
setchr8(0);
setprg8r(0x10, 0x6000, 0);
setprg32(0x8000, (latche >> 3) & 0xf);
setmirror(((latche >> 1) & 1) ^ 1);
}
void Mapper242_Init(CartInfo *info) {
M242TwoChips = info->PRGRomSize &0x20000 && info->PRGRomSize >0x20000;
Latch_Init(info, M242Sync, NULL, 0x0000, 0x8000, 0xFFFF, 1);
}