AxibugEmuOnline/References/VirtuaNESex_src_191105/NES/Mapper/Mapper178.cpp
2024-08-05 17:58:53 +08:00

48 lines
1.3 KiB
C++

//////////////////////////////////////////////////////////////////////////
// Mapper178 Education / WaiXing_FS305 //
//////////////////////////////////////////////////////////////////////////
void Mapper178::Reset()
{
reg[0]=0;
reg[1]=0;
reg[2]=0;
banknum=0;
SetBank_CPU();
OP_rom = 0;
DWORD crc = nes->rom->GetPROM_CRC();
if( crc == 0x925926BC //[ES-XXXX] Kou Dai Zuan Shi Zhi Chong Wu Xiao Jing Ling 2 (C)
|| crc == 0xB0B13DBD ) //[ES-XXXX] Chong Wu Fei Cui Zhi Chong Wu Xiao Jing Ling IV (C)
{
OP_rom = 1;
}
}
void Mapper178::WriteLow( WORD addr, BYTE data )
{
// if( addr >= 0x4000 && addr <= 0x5FFF ) DEBUGOUT("Address=%04X Data=%02X\n", addr&0xFFFF, data&0xFF );
if( addr==0x4800 ){
if( data & 0x01 ) SetVRAM_Mirror( VRAM_HMIRROR );
else SetVRAM_Mirror( VRAM_VMIRROR );
}else if( addr==0x4801 ){
reg[0]=(data>>1) & 0x0F;
if(OP_rom) reg[0]=data<<2;
SetBank_CPU();
}else if( addr==0x4802 ){
reg[1]=data<<2;
if(OP_rom) reg[1]=data;
SetBank_CPU();
}else if( addr==0x4803 ){
//unknown
reg[2]=data;
}else if( addr>=0x6000 ) {
CPU_MEM_BANK[addr>>13][addr&0x1FFF] = data;
}
}
void Mapper178::SetBank_CPU()
{
banknum=reg[0] | reg[1];
// DEBUGOUT("Bank=%02X\n", banknum&0xFF );
SetPROM_32K_Bank( banknum );
}