71 lines
3.0 KiB
C++
71 lines
3.0 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper091 PC-HK-SF3 //
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//////////////////////////////////////////////////////////////////////////
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void Mapper091::Reset()
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{
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SetPROM_32K_Bank( PROM_8K_SIZE-2, PROM_8K_SIZE-1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
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if( VROM_8K_SIZE ) {
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SetVROM_8K_Bank( 0, 0, 0, 0, 0, 0, 0, 0 );
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}
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irq_enable = 0;
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irq_counter = 0;
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nes->SetRenderMethod( NES::POST_ALL_RENDER );
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}
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void Mapper091::WriteLow( WORD addr, BYTE data )
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{
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//DEBUGOUT( "$%04X:$%02X(%3d) L=%3d\n", addr, data, data, nes->GetScanline() );
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switch( addr & 0xF003 ) {
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case 0x6000:
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case 0x6001:
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case 0x6002:
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case 0x6003:
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SetVROM_2K_Bank( (addr&0x03)*2, data );
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break;
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case 0x7000:
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SetPROM_8K_Bank( 4, data );
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break;
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case 0x7001:
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SetPROM_8K_Bank( 5, data );
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break;
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case 0x7002:
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irq_enable = 0;
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irq_counter = 0;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0x7003:
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irq_enable = 1;
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break;
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}
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}
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void Mapper091::HSync( INT scanline )
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{
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if( (scanline >= 0 && scanline < 240) && nes->ppu->IsDispON() ) {
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if( irq_enable ) {
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irq_counter++;
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}
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if( irq_counter >= 8 ) {
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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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void Mapper091::SaveState( LPBYTE p )
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{
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p[0] = irq_enable;
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p[1] = irq_counter;
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}
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void Mapper091::LoadState( LPBYTE p )
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{
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irq_enable = p[0];
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irq_counter = p[1];
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}
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