AxibugEmuOnline/References/virtuanessrc097-master/NES/Mapper/Mapper167.cpp
2024-08-05 17:58:53 +08:00

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//////////////////////////////////////////////////////////////////////////
// Mapper012 Subor Computer V4.0 //
//////////////////////////////////////////////////////////////////////////
void Mapper167::Reset()
{
DWORD crc;
regs[0] = 0;
regs[1] = 0;
regs[2] = 0;
regs[3] = 0;
crc = nes->rom->GetPROM_CRC();
if(crc==0x82F1Fb96){
// Subor Computer(Russia)
rom_type = 1;
}else{
// Subor Computer(Chinese)
rom_type = 0;
}
SetBank_CPU();
SetBank_PPU();
}
void Mapper167::Write(WORD addr, BYTE data)
{
int idx;
idx = (addr>>13)&0x03;
regs[idx]=data;
SetBank_CPU();
SetBank_PPU();
// DEBUGOUT("write to %04x:%02x\n", addr, data);
}
void Mapper167::SetBank_CPU()
{
int base, bank;
base = ((regs[0]^regs[1])&0x10)<<1;
bank = (regs[2]^regs[3])&0x1f;
if(regs[1]&0x08){
bank &= 0xfe;
if(rom_type==0){
SetPROM_16K_Bank(4, base+bank+1);
SetPROM_16K_Bank(6, base+bank+0);
}else{
SetPROM_16K_Bank(6, base+bank+1);
SetPROM_16K_Bank(4, base+bank+0);
}
// DEBUGOUT("32K MODE!\n");
}else{
if(regs[1]&0x04){
SetPROM_16K_Bank(4, 0x1f);
SetPROM_16K_Bank(6, base+bank);
// DEBUGOUT("HIGH 16K MODE!\n");
}else{
SetPROM_16K_Bank(4, base+bank);
if(rom_type==0){
SetPROM_16K_Bank(6, 0x20);
}else{
SetPROM_16K_Bank(6, 0x07);
}
// DEBUGOUT("LOW 16K MODE!\n");
}
}
}
void Mapper167::SetBank_PPU()
{
SetCRAM_8K_Bank(0);
}
void Mapper167::SaveState( LPBYTE p )
{
p[0] = regs[0];
p[1] = regs[1];
p[2] = regs[2];
p[3] = regs[3];
p[4] = rom_type;
}
void Mapper167::LoadState( LPBYTE p )
{
regs[0] = p[0];
regs[1] = p[1];
regs[2] = p[2];
regs[3] = p[3];
rom_type = p[4];
}