92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper009 Nintendo MMC2 //
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//////////////////////////////////////////////////////////////////////////
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void Mapper009::Reset()
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{
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SetPROM_32K_Bank( 0, PROM_8K_SIZE-3, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
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reg[0] = 0; reg[1] = 4;
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reg[2] = 0; reg[3] = 0;
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latch_a = 0xFE;
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latch_b = 0xFE;
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SetVROM_4K_Bank( 0, 4 );
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SetVROM_4K_Bank( 4, 0 );
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nes->ppu->SetChrLatchMode( TRUE );
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}
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void Mapper009::Write( WORD addr, BYTE data )
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{
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switch( addr & 0xF000 ) {
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case 0xA000:
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SetPROM_8K_Bank( 4, data );
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break;
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case 0xB000:
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reg[0] = data;
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if( latch_a == 0xFD ) {
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SetVROM_4K_Bank( 0, reg[0] );
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}
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break;
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case 0xC000:
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reg[1] = data;
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if( latch_a == 0xFE ) {
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SetVROM_4K_Bank( 0, reg[1] );
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}
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break;
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case 0xD000:
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reg[2] = data;
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if( latch_b == 0xFD ) {
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SetVROM_4K_Bank( 4, reg[2] );
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}
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break;
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case 0xE000:
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reg[3] = data;
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if( latch_b == 0xFE ) {
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SetVROM_4K_Bank( 4, reg[3] );
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}
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break;
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case 0xF000:
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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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}
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}
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void Mapper009::PPU_ChrLatch( WORD addr )
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{
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if( (addr&0x1FF0) == 0x0FD0 && latch_a != 0xFD ) {
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latch_a = 0xFD;
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SetVROM_4K_Bank( 0, reg[0] );
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} else if( (addr&0x1FF0) == 0x0FE0 && latch_a != 0xFE ) {
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latch_a = 0xFE;
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SetVROM_4K_Bank( 0, reg[1] );
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} else if( (addr&0x1FF0) == 0x1FD0 && latch_b != 0xFD ) {
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latch_b = 0xFD;
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SetVROM_4K_Bank( 4, reg[2] );
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} else if( (addr&0x1FF0) == 0x1FE0 && latch_b != 0xFE ) {
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latch_b = 0xFE;
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SetVROM_4K_Bank( 4, reg[3] );
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}
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}
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void Mapper009::SaveState( LPBYTE p )
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{
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p[0] = reg[0];
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p[1] = reg[1];
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p[2] = reg[2];
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p[3] = reg[3];
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p[4] = latch_a;
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p[5] = latch_b;
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}
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void Mapper009::LoadState( LPBYTE p )
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{
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reg[0] = p[0];
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reg[1] = p[1];
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reg[2] = p[2];
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reg[3] = p[3];
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latch_a = p[4];
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latch_b = p[5];
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}
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