89 lines
1.8 KiB
C++
89 lines
1.8 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper182 PC-SuperDonkeyKong //
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//////////////////////////////////////////////////////////////////////////
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void Mapper182::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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reg = 0;
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irq_enable = 0;
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irq_counter = 0;
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}
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void Mapper182::Write( WORD addr, BYTE data )
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{
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switch( addr & 0xF003 ) {
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case 0x8001:
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if( data & 0x01 ) SetVRAM_Mirror( VRAM_HMIRROR );
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else SetVRAM_Mirror( VRAM_VMIRROR );
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break;
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case 0xA000:
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reg = data & 0x07;
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break;
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case 0xC000:
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switch( reg ) {
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case 0:
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SetVROM_1K_Bank( 0, (data&0xFE)+0 );
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SetVROM_1K_Bank( 1, (data&0xFE)+1 );
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break;
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case 1:
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SetVROM_1K_Bank( 5, data );
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break;
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case 2:
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SetVROM_1K_Bank( 2, (data&0xFE)+0 );
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SetVROM_1K_Bank( 3, (data&0xFE)+1 );
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break;
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case 3:
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SetVROM_1K_Bank( 7, data );
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break;
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case 4:
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SetPROM_8K_Bank( 4, data );
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break;
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case 5:
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SetPROM_8K_Bank( 5, data );
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break;
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case 6:
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SetVROM_1K_Bank( 4, data );
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break;
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case 7:
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SetVROM_1K_Bank( 6, data );
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break;
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}
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break;
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case 0xE003:
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irq_enable = data;
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irq_counter = data;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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}
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}
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void Mapper182::HSync( INT scanline )
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{
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if( irq_enable ) {
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if( (scanline >= 0 && scanline <= 239) && nes->ppu->IsDispON() ) {
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if( !(--irq_counter) ) {
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irq_enable = 0;
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irq_counter = 0;
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// nes->cpu->IRQ_NotPending();
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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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}
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void Mapper182::SaveState( LPBYTE p )
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{
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p[0] = reg;
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p[1] = irq_enable;
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p[2] = irq_counter;
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}
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void Mapper182::LoadState( LPBYTE p )
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{
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reg = p[0];
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irq_enable = p[1];
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irq_counter = p[2];
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}
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