forked from sin365/AxibugEmuOnline
132 lines
4.9 KiB
C++
132 lines
4.9 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper112 ASDER Mapper //
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//////////////////////////////////////////////////////////////////////////
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void Mapper112::Reset()
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{
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for( INT i = 0; i < 4; i++ ) {
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reg[i] = 0x00;
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}
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prg0 = 0;
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prg1 = 1;
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SetBank_CPU();
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chr01 = 0;
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chr23 = 2;
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chr4 = 4;
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chr5 = 5;
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chr6 = 6;
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chr7 = 7;
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SetBank_PPU();
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}
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void Mapper112::Write( WORD addr, BYTE data )
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{
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switch( addr ) {
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case 0x8000:
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reg[0] = data;
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SetBank_CPU();
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SetBank_PPU();
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break;
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case 0xA000:
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reg[1] = data;
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switch( reg[0] & 0x07 ) {
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case 0x00:
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prg0 = (data&(PROM_8K_SIZE-1));
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SetBank_CPU();
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break;
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case 0x01:
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prg1 = (data&(PROM_8K_SIZE-1));
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SetBank_CPU();
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break;
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case 0x02:
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chr01 = data & 0xFE;
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SetBank_PPU();
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break;
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case 0x03:
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chr23 = data & 0xFE;
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SetBank_PPU();
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break;
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case 0x04:
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chr4 = data;
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SetBank_PPU();
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break;
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case 0x05:
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chr5 = data;
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SetBank_PPU();
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break;
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case 0x06:
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chr6 = data;
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SetBank_PPU();
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break;
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case 0x07:
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chr7 = data;
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SetBank_PPU();
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break;
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}
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break;
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case 0xC000:
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reg[3] = data;
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SetBank_PPU();
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case 0xE000:
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reg[2] = data;
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if( !nes->rom->Is4SCREEN() ) {
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if( data & 0x01 ) SetVRAM_Mirror( VRAM_HMIRROR );
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else SetVRAM_Mirror( VRAM_VMIRROR );
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}
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SetBank_PPU();
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break;
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}
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}
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void Mapper112::SetBank_CPU()
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{
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SetPROM_32K_Bank( prg0, prg1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
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}
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void Mapper112::SetBank_PPU()
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{
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if( reg[2] & 0x02 ) {
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SetVROM_8K_Bank( chr01, chr01+1, chr23, chr23+1, chr4, chr5, chr6, chr7 );
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} else {
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SetVROM_8K_Bank(((reg[3]<<6)&0x100)+chr01,
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((reg[3]<<6)&0x100)+chr01+1,
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((reg[3]<<5)&0x100)+chr23,
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((reg[3]<<5)&0x100)+chr23+1,
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((reg[3]<<4)&0x100)+chr4,
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((reg[3]<<3)&0x100)+chr5,
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((reg[3]<<2)&0x100)+chr6,
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((reg[3]<<1)&0x100)+chr7 );
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}
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}
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void Mapper112::SaveState( LPBYTE p )
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{
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for( INT i = 0; i < 4; i++ ) {
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p[i] = reg[i];
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}
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p[ 4] = chr01;
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p[ 5] = chr23;
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p[ 6] = chr4;
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p[ 7] = chr5;
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p[ 8] = chr6;
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p[ 9] = chr7;
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}
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void Mapper112::LoadState( LPBYTE p )
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{
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for( INT i = 0; i < 4; i++ ) {
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reg[i] = p[i];
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}
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chr01 = p[ 4];
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chr23 = p[ 5];
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chr4 = p[ 6];
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chr5 = p[ 7];
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chr6 = p[ 8];
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chr7 = p[ 9];
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}
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