diff options
| author | Alexey 'Cluster' Avdyukhin <clusterrr@clusterrr.com> | 2023-10-02 21:42:48 +0300 |
|---|---|---|
| committer | Alexey 'Cluster' Avdyukhin <clusterrr@clusterrr.com> | 2023-10-02 21:42:48 +0300 |
| commit | 1ffa4d7f0c66348cc94832bfec7aec0a1d2f98fd (patch) | |
| tree | e0ec329d79099f3c0e59b7934646101f67d20488 | |
| parent | d2ee6351c08518c866bb48d89f58a67bb36931fc (diff) | |
Mapper 134 CHR and PRG masks
| -rw-r--r-- | src/boards/mmc3.cpp | 37 |
1 files changed, 30 insertions, 7 deletions
diff --git a/src/boards/mmc3.cpp b/src/boards/mmc3.cpp index e7e229cf..b43e243d 100644 --- a/src/boards/mmc3.cpp +++ b/src/boards/mmc3.cpp @@ -860,32 +860,55 @@ void Mapper119_Init(CartInfo *info) { // ---------------------------- Mapper 134 ------------------------------
static void M134PW(uint32 A, uint8 V) {
- setprg8(A, (V & 0x1F) | ((EXPREGS[0] & 2) << 4));
+ if ((EXPREGS[1] & 0x88) == 0x80)
+ setprg32(A, (EXPREGS[0] & 0x10) | ((EXPREGS[1] & 2) << 2)); // NROM-256
+ else if ((EXPREGS[1] & 0x88) == 0x88)
+ setprg16(0x8000 | (A & 0x4000), ((EXPREGS[0] & 0x10) << 1) | ((V & 0x10) >> 1) | ((EXPREGS[1] & 3) << 3)); // NROM-128
+ else if (EXPREGS[1] & 4)
+ setprg8(A, ((EXPREGS[0] & 0x10) << 2) | (V & 0x0F) | ((EXPREGS[1] & 3) << 4)); // MMC3 128KB mask
+ else
+ setprg8(A, ((EXPREGS[0] & 0x10) << 2) | (V & 0x1F) | ((EXPREGS[1] & 2) << 4)); // MMC3 256KB mask
}
static void M134CW(uint32 A, uint8 V) {
- setchr1(A, (V & 0xFF) | ((EXPREGS[0] & 0x20) << 3));
+ /*
+ // CNROM mode. Unclear. Untested. Not compatible with some games.
+ if (EXPREGS[0] & 0x08)
+ setchr8(EXPREGS[2]);
+ else
+ */
+ if (EXPREGS[1] & 0x40)
+ setchr1(A, ((EXPREGS[0] & 0x20) << 4) | (V & 0x7F) | ((EXPREGS[1] & 0x30) << 3)); // 128KB mask
+ else
+ setchr1(A, ((EXPREGS[0] & 0x20) << 4) | (V & 0xFF) | ((EXPREGS[1] & 0x20) << 3)); // 256KB mask
}
static DECLFW(M134Write) {
- EXPREGS[0] = V;
+ if (EXPREGS[0] & 0x80)
+ {
+ // locked (except $6002.0-1)
+ if ((A & 3) == 2)
+ EXPREGS[2] = (EXPREGS[2] & 0xFC) | (V & 3);
+ return;
+ }
+ EXPREGS[A & 3] = V;
FixMMC3CHR(MMC3_cmd);
FixMMC3PRG(MMC3_cmd);
}
static void M134Power(void) {
- EXPREGS[0] = 0;
+ EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = 0;
GenMMC3Power();
- SetWriteHandler(0x6001, 0x6001, M134Write);
+ SetWriteHandler(0x6001, 0x7FFF, M134Write);
}
static void M134Reset(void) {
- EXPREGS[0] = 0;
+ EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = 0;
MMC3RegReset();
}
void Mapper134_Init(CartInfo *info) {
- GenMMC3_Init(info, 256, 256, 0, 0);
+ GenMMC3_Init(info, 512, 512, 0, 0);
pwrap = M134PW;
cwrap = M134CW;
info->Power = M134Power;
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