278 lines
6.6 KiB
C++
278 lines
6.6 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// BoardFK23C //
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//////////////////////////////////////////////////////////////////////////
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//code by CaH4e3 from fceumm
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void BoardFK23C::Reset()
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{
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INT BoardNo = NES_ROM_get_unifBoardID(nes->rom->GetBoardName());
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if((BoardNo==379)||(nes->rom->GetMapperNo()==176)){ //BMC-FK23C
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EXPREGS[0] = 4;
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EXPREGS[1] = 0xFF;
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EXPREGS[2] = EXPREGS[3] = 0;
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}else if(BoardNo==635){ //BMC-FK23CA
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EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = 0;
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}
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dipswitch = unromchr = 0;
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EXPREGS[4] = EXPREGS[5] = EXPREGS[6] = EXPREGS[7] = 0xFF;
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IRQReload = IRQCount = IRQLatch = IRQa = 0;
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MMC3cmd = A000B = A001B = 0;
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DRegBuf[0] = 0;
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DRegBuf[1] = 2;
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DRegBuf[2] = 4;
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DRegBuf[3] = 5;
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DRegBuf[4] = 6;
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DRegBuf[5] = 7;
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DRegBuf[6] = 0;
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DRegBuf[7] = 1;
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FixFK23MMC3PRG(MMC3cmd);
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FixFK23MMC3CHR(MMC3cmd);
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}
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void BoardFK23C::WriteLow( WORD addr, BYTE data )
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{
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if((addr>=0x5000)&&(addr<=0x5FFF))
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{
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if (dipswitch) {
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if (addr & (1 << (dipswitch + 3))) {
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EXPREGS[addr & 3] = data;
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FixFK23MMC3PRG(MMC3cmd);
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FixFK23MMC3CHR(MMC3cmd);
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}
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} else {
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EXPREGS[addr & 3] = data;
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FixFK23MMC3PRG(MMC3cmd);
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FixFK23MMC3CHR(MMC3cmd);
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}
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if (EXPREGS[3] & 2) EXPREGS[0] &= ~7;
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}
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}
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void BoardFK23C::Write( WORD addr, BYTE data )
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{
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if (EXPREGS[0] & 0x40) {
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if (EXPREGS[0] & 0x30)
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unromchr = 0;
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else {
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unromchr = data & 3;
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FixFK23MMC3CHR(MMC3cmd);
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}
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} else {
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if ((addr == 0x8001) && (EXPREGS[3] & 2) && (MMC3cmd & 8)) {
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EXPREGS[4 | (MMC3cmd & 3)] = data;
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FixFK23MMC3PRG(MMC3cmd);
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FixFK23MMC3CHR(MMC3cmd);
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} else
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if (addr < 0xC000) {
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if (!(VROM_1K_SIZE)) {
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if ((addr == 0x8000) && (data == 0x46))
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data = 0x47;
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else if ((addr == 0x8000) && (data == 0x47))
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data = 0x46;
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}
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MMC3CMDWrite(addr, data);
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FixFK23MMC3PRG(MMC3cmd);
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} else
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MMC3IRQWrite(addr, data);
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}
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}
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void BoardFK23C::MMC3CMDWrite( WORD addr, BYTE data )
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{
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switch (addr & 0xE001) {
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case 0x8000:
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if ((data & 0x40) != (MMC3cmd & 0x40))
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FixFK23MMC3PRG(data);
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if ((data & 0x80) != (MMC3cmd & 0x80))
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FixFK23MMC3CHR(data);
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MMC3cmd = data;
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break;
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case 0x8001:
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{
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int cbase = (MMC3cmd & 0x80) << 5;
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DRegBuf[MMC3cmd & 0x7] = data;
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switch (MMC3cmd & 0x07) {
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case 0:
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PPUSW((cbase ^ 0x000), data & (~1));
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PPUSW((cbase ^ 0x400), data | 1);
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break;
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case 1:
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PPUSW((cbase ^ 0x800), data & (~1));
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PPUSW((cbase ^ 0xC00), data | 1);
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break;
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case 2:
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PPUSW(cbase ^ 0x1000, data);
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break;
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case 3:
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PPUSW(cbase ^ 0x1400, data);
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break;
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case 4:
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PPUSW(cbase ^ 0x1800, data);
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break;
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case 5:
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PPUSW(cbase ^ 0x1C00, data);
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break;
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case 6:
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if (MMC3cmd&0x40) CPUSW(0xC000, data);
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else CPUSW(0x8000, data);
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break;
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case 7:
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CPUSW(0xA000, data);
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break;
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}
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break;
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}
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case 0xA000:
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A000B = data;
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if (!nes->rom->Is4SCREEN()) {
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if (A000B & 0x01) SetVRAM_Mirror(VRAM_HMIRROR);
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else SetVRAM_Mirror(VRAM_VMIRROR);
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}
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break;
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case 0xA001:
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A001B = data;
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break;
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}
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}
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void BoardFK23C::MMC3IRQWrite( WORD addr, BYTE data )
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{
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switch (addr & 0xE001) {
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case 0xC000: IRQReload = 0;IRQCount = data; break;
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case 0xC001: IRQReload = 0;IRQLatch = data; break;
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case 0xE000: IRQReload = 0;IRQa = 0;nes->cpu->ClrIRQ(IRQ_MAPPER); break;
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case 0xE001: IRQReload = 0;IRQa = 1; break;
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}
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}
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void BoardFK23C::PPUSW(WORD A, BYTE V)
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{
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if (VROM_1K_SIZE){
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if (EXPREGS[0] & 0x40)
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SetVROM_8K_Bank(EXPREGS[2] | unromchr);
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else if (EXPREGS[0] & 0x20) {
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SetVROM_1K_Bank(A>>10, V);
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} else {
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uint16 base = (EXPREGS[2] & 0x7F) << 3;
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if (EXPREGS[3] & 2) {
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int cbase = (MMC3cmd & 0x80) << 5;
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SetVROM_1K_Bank(A>>10, V | base);
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SetVROM_1K_Bank((0x0000 ^ cbase)>>10, DRegBuf[0] | base);
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SetVROM_1K_Bank((0x0400 ^ cbase)>>10, EXPREGS[6] | base);
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SetVROM_1K_Bank((0x0800 ^ cbase)>>10, DRegBuf[1] | base);
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SetVROM_1K_Bank((0x0c00 ^ cbase)>>10, EXPREGS[7] | base);
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} else
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SetVROM_1K_Bank(A>>10, V | base);
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}
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}else{
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if (EXPREGS[0] & 0x40)
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SetYCRAM_8K_Bank(EXPREGS[2] | unromchr);
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else if (EXPREGS[0] & 0x20) {
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SetYCRAM_1K_Bank(A>>10, V);
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} else {
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uint16 base = (EXPREGS[2] & 0x7F) << 3;
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if (EXPREGS[3] & 2) {
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int cbase = (MMC3cmd & 0x80) << 5;
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SetYCRAM_1K_Bank(A>>10, V | base);
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SetYCRAM_1K_Bank((0x0000 ^ cbase)>>10, DRegBuf[0] | base);
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SetYCRAM_1K_Bank((0x0400 ^ cbase)>>10, EXPREGS[6] | base);
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SetYCRAM_1K_Bank((0x0800 ^ cbase)>>10, DRegBuf[1] | base);
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SetYCRAM_1K_Bank((0x0c00 ^ cbase)>>10, EXPREGS[7] | base);
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} else
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SetYCRAM_1K_Bank(A>>10, V | base);
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}
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}
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}
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void BoardFK23C::CPUSW(WORD A, BYTE V)
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{
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uint32 bank = (EXPREGS[1] & 0x1F);
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uint32 hiblock = ((EXPREGS[0] & 8) << 4) | ((EXPREGS[0] & 0x80) << 1) | ((!(VROM_1K_SIZE)) ? ((EXPREGS[2] & 0x40) << 3) : 0);
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uint32 block = (EXPREGS[1] & 0x60) | hiblock;
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uint32 extra = (EXPREGS[3] & 2);
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switch (EXPREGS[0] & 7) {
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case 0:
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SetPROM_8K_Bank(A>>13, (block << 1) | (V & 0x3F));
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if (extra) {
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SetPROM_8K_Bank(6, EXPREGS[4]);
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SetPROM_8K_Bank(7, EXPREGS[5]);
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}
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break;
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case 1:
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SetPROM_8K_Bank(A>>13, ((hiblock | (EXPREGS[1] & 0x70)) << 1) | (V & 0x1F));
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if (extra) {
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SetPROM_8K_Bank(6, EXPREGS[4]);
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SetPROM_8K_Bank(7, EXPREGS[5]);
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}
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break;
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case 2:
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SetPROM_8K_Bank(A>>13, ((hiblock | (EXPREGS[1] & 0x78)) << 1) | (V & 0x0F));
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if (extra) {
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SetPROM_8K_Bank(6, EXPREGS[4]);
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SetPROM_8K_Bank(7, EXPREGS[5]);
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}
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break;
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case 3:
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SetPROM_16K_Bank(4, (bank | block));
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SetPROM_16K_Bank(6, (bank | block));
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break;
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case 4:
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SetPROM_32K_Bank((bank | block) >> 1);
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break;
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}
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SetPROM_Bank( 3, &WRAM[0x2000*(A001B&3)], BANKTYPE_RAM );
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}
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void BoardFK23C::FixFK23MMC3PRG(BYTE data)
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{
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if (data & 0x40) {
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CPUSW(0xC000, DRegBuf[6]);
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CPUSW(0x8000, ~1);
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} else {
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CPUSW(0x8000, DRegBuf[6]);
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CPUSW(0xC000, ~1);
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}
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CPUSW(0xA000, DRegBuf[7]);
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CPUSW(0xE000, ~0);
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}
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void BoardFK23C::FixFK23MMC3CHR(BYTE data)
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{
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int cbase = (data & 0x80) << 5;
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PPUSW((cbase ^ 0x000), DRegBuf[0] & (~1));
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PPUSW((cbase ^ 0x400), DRegBuf[0] | 1);
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PPUSW((cbase ^ 0x800), DRegBuf[1] & (~1));
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PPUSW((cbase ^ 0xC00), DRegBuf[1] | 1);
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PPUSW(cbase ^ 0x1000, DRegBuf[2]);
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PPUSW(cbase ^ 0x1400, DRegBuf[3]);
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PPUSW(cbase ^ 0x1800, DRegBuf[4]);
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PPUSW(cbase ^ 0x1c00, DRegBuf[5]);
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}
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void BoardFK23C::HSync(INT scanline)
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{
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if ((scanline >= 0 && scanline <= 239)) {
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if (nes->ppu->IsDispON())
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{
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if (IRQa && !IRQReload) {
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if (scanline == 0) {
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if (IRQCount) {
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IRQCount -= 1;
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}
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}
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if (!(IRQCount)){
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IRQReload = 0xFF;
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IRQCount = IRQLatch;
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nes->cpu->SetIRQ(IRQ_MAPPER);
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}
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IRQCount--;
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}
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}
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}
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}
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