134 lines
2.5 KiB
C++
134 lines
2.5 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper222 //
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//////////////////////////////////////////////////////////////////////////
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void Mapper222::Reset()
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{
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SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
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SetVROM_8K_Bank( 0 );
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SetVRAM_Mirror( VRAM_VMIRROR );
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for(INT i=0;i<8;i++) reg[i] = i;
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irq_enable = 0;
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irq_counter = 0;
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VBankNO = 0;
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}
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BYTE Mapper222::ReadLow( WORD addr )
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{
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switch( addr & 0xF800 ) {
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case 0x4800: break;
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case 0x5000: return (BYTE)irq_counter&0x00FF;
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case 0x5800: return (BYTE)((irq_counter>>8)&0x7F);
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case 0x6000:
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case 0x6800:
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case 0x7000:
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case 0x7800: return Mapper::ReadLow( addr );
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}
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return (BYTE)(addr>>8);
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}
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void Mapper222::WriteLow( WORD addr, BYTE data )
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{
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switch( addr & 0xF800 ) {
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case 0x4800:
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//
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break;
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case 0x5000:
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irq_counter = (irq_counter & 0xFF00) | (WORD)data;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0x5800:
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//
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break;
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case 0x6000:
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case 0x6800:
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case 0x7000:
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case 0x7800:
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Mapper::WriteLow( addr, data );
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break;
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}
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}
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void Mapper222::Write( WORD addr, BYTE data )
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{
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switch( addr & 0xF003 ) {
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case 0x8000:
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SetPROM_8K_Bank( 4, data );
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break;
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case 0x9000:
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if(VROM_1K_SIZE>128){
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if( data&0x40 ) 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 0xA000:
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SetPROM_8K_Bank( 5, data );
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break;
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case 0xB000:
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SetVROM_1K_Bank( 0, data );
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VBankNO = data;
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break;
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case 0xB002:
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SetVROM_1K_Bank( 1, data );
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break;
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case 0xC000:
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SetVROM_1K_Bank( 2, data );
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break;
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case 0xC002:
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SetVROM_1K_Bank( 3, data );
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break;
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case 0xD000:
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SetVROM_1K_Bank( 4, data );
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break;
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case 0xD002:
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SetVROM_1K_Bank( 5, data );
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break;
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case 0xE000:
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SetVROM_1K_Bank( 6, data );
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break;
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case 0xE002:
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SetVROM_1K_Bank( 7, data );
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break;
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case 0xF000:
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//
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break;
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case 0xF001:
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if(VBankNO==0x20){ //Õë¶Ô Dragon Ninja (J) µÚÈý¹Ø
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if(data) data = (data+0x12)>>1;
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}else{
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if(data) data = (data+0x10)>>1;
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}
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irq_counter = (irq_counter & 0x00FF) | ((WORD)(data & 0x7F) << 8);
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irq_enable = data;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0xF002:
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//
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break;
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}
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}
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void Mapper222::Clock( INT cycles )
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{
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if( irq_enable ) {
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if( (irq_counter+=cycles) >= 0x7FFF ) {
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irq_enable = 0;
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irq_counter = 0x7FFF;
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nes->cpu->SetIRQ( IRQ_MAPPER );
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}
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}
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}
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void Mapper222::SaveState( LPBYTE p )
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{
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//
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}
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void Mapper222::LoadState( LPBYTE p )
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{
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//
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}
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