87 lines
1.7 KiB
C++
87 lines
1.7 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper117 San Ko Gu (TW) : //
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//////////////////////////////////////////////////////////////////////////
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void Mapper117::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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if( VROM_1K_SIZE ) {
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SetVROM_8K_Bank( 0 );
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}
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}
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void Mapper117::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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SetPROM_8K_Bank( 4, data );
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break;
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case 0x8001:
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SetPROM_8K_Bank( 5, data );
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break;
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case 0x8002:
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SetPROM_8K_Bank( 6, data );
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break;
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case 0xA000:
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SetVROM_1K_Bank( 0, data );
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break;
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case 0xA001:
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SetVROM_1K_Bank( 1, data );
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break;
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case 0xA002:
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SetVROM_1K_Bank( 2, data );
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break;
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case 0xA003:
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SetVROM_1K_Bank( 3, data );
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break;
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case 0xA004:
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SetVROM_1K_Bank( 4, data );
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break;
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case 0xA005:
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SetVROM_1K_Bank( 5, data );
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break;
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case 0xA006:
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SetVROM_1K_Bank( 6, data );
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break;
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case 0xA007:
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SetVROM_1K_Bank( 7, data );
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break;
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case 0xC001:
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case 0xC002:
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case 0xC003:
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irq_counter = data;
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break;
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case 0xE000:
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irq_enable = data & 1;
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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 Mapper117::HSync( INT scanline )
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{
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if( (scanline >= 0 && scanline <= 239) ) {
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if( nes->ppu->IsDispON() ) {
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if( irq_enable ) {
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if(irq_counter==scanline) {
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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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nes->cpu->SetIRQ( IRQ_TRIGGER );
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}
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}
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}
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}
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}
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void Mapper117::SaveState( LPBYTE p )
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{
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p[0] = irq_counter;
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p[1] = irq_enable;
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}
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void Mapper117::LoadState( LPBYTE p )
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{
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irq_counter=p[0];
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irq_enable=p[1];
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}
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