97 lines
1.7 KiB
C++
97 lines
1.7 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper043 SMB2J //
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//////////////////////////////////////////////////////////////////////////
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void Mapper043::Reset()
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{
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irq_enable = 0xFF;
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irq_counter = 0;
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SetPROM_8K_Bank( 3, 2 );
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SetPROM_32K_Bank( 1, 0, 4, 9 );
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if( VROM_1K_SIZE ) {
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SetVROM_8K_Bank( 0 );
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}
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}
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BYTE Mapper043::ReadLow( WORD addr )
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{
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if( 0x5000 <= addr && addr < 0x6000 ) {
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LPBYTE pPtr = nes->rom->GetPROM();
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return pPtr[0x2000*8+0x1000+(addr-0x5000)];
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}
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return (BYTE)(addr>>8);
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}
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void Mapper043::ExWrite( WORD addr, BYTE data )
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{
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if( (addr&0xF0FF) == 0x4022 ) {
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switch( data&0x07 ) {
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case 0x00:
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case 0x02:
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case 0x03:
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case 0x04:
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SetPROM_8K_Bank( 6, 4 );
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break;
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case 0x01:
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SetPROM_8K_Bank( 6, 3 );
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break;
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case 0x05:
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SetPROM_8K_Bank( 6, 7 );
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break;
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case 0x06:
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SetPROM_8K_Bank( 6, 5 );
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break;
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case 0x07:
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SetPROM_8K_Bank( 6, 6 );
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break;
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}
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}
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}
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void Mapper043::WriteLow( WORD addr, BYTE data )
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{
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if( (addr&0xF0FF) == 0x4022 ) {
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ExWrite( addr, data );
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}
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}
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void Mapper043::Write( WORD addr, BYTE data )
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{
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if( addr == 0x8122 ) {
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if( data&0x03 ) {
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irq_enable = 1;
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} else {
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irq_counter = 0;
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irq_enable = 0;
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}
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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}
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}
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void Mapper043::HSync( INT scanline )
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{
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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if( irq_enable ) {
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irq_counter += 341;
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if( irq_counter >= 12288 ) {
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irq_counter = 0;
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// nes->cpu->IRQ();
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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 Mapper043::SaveState( LPBYTE p )
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{
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p[0] = irq_enable;
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*(INT*)&p[1] = irq_counter;
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}
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void Mapper043::LoadState( LPBYTE p )
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{
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irq_enable = p[0];
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irq_counter = *(INT*)&p[1];
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}
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