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Mapper 134 CHR and PRG masks

This commit is contained in:
Alexey 'Cluster' Avdyukhin 2023-10-02 22:42:48 +04:00
parent d2ee6351c0
commit 1ffa4d7f0c
1 changed files with 30 additions and 7 deletions
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37
src/boards/mmc3.cpp
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@ -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;