admin/ci-libretro-fceumm
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

Add mapper 468

Browse Source
This commit is contained in:
NewRisingSun
2022-12-30 23:56:50 +01:00
parent 5ca702053e
commit 07284ca4af
17 changed files with 1074 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
src/boards/468_mmc24.h Normal file
View File

@@ -0,0 +1,67 @@
#define MMC24_reg regByte
static void MMC2_sync() {
setprg8(0x8000, MMC24_reg[0] &prgAND | prgOR &~prgAND);
setprg8(0xA000, 0xFD &prgAND | prgOR &~prgAND);
setprg8(0xC000, 0xFE &prgAND | prgOR &~prgAND);
setprg8(0xE000, 0xFF &prgAND | prgOR &~prgAND);
setchr4(0x0000, MMC24_reg[1 +MMC24_reg[6]]);
setchr4(0x1000, MMC24_reg[3 +MMC24_reg[7]]);
setmirror(MMC24_reg[5] &1? MI_H: MI_V);
}
static void MMC4_sync() {
int AND =prgAND >>1;
int OR =prgOR >>1;
setprg16(0x8000, MMC24_reg[0] &AND | OR &~AND);
setprg16(0xC000, 0xFF &AND | OR &~AND);
setchr4(0x0000, MMC24_reg[1 +MMC24_reg[6]]);
setchr4(0x1000, MMC24_reg[3 +MMC24_reg[7]]);
setmirror(MMC24_reg[5] &1? MI_H: MI_V);
}
static DECLFW(MMC24_writeReg) {
MMC24_reg[(A >>12) -0xA] =V;
sync();
}
static void FP_FASTAPASS(1) MMC24_ppuHook(uint32 A) {
uint8 l, h = A >> 8;
if (h >= 0x20 || ((h & 0xF) != 0xF)) return;
l = A & 0xF0;
if (h < 0x10) {
if (l == 0xD0) {
MMC24_reg[6] =0;
sync();
} else if (l == 0xE0) {
MMC24_reg[6] =1;
sync();
}
} else {
if (l == 0xD0) {
MMC24_reg[7] =0;
sync();
} else if (l == 0xE0) {
MMC24_reg[7] =1;
sync();
}
}
}
void MMC2_reset(uint8 clearRegs) {
sync =MMC2_sync;
prgAND =0x0F;
PPU_hook =MMC24_ppuHook;
SetWriteHandler(0xA000, 0xFFFF, MMC24_writeReg);
sync();
}
void MMC4_reset(uint8 clearRegs) {
sync =MMC4_sync;
prgAND =mapperFlags &2? 0x0F: 0x1F;
PPU_hook =MMC24_ppuHook;
SetWriteHandler(0xA000, 0xFFFF, MMC24_writeReg);
sync();
}
#undef MMC24_reg