101 lines
2.1 KiB
C++
101 lines
2.1 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper067 SunSoft Mapper 3 //
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//////////////////////////////////////////////////////////////////////////
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void Mapper067::Reset()
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{
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irq_enable = 0;
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irq_toggle = 0;
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irq_counter = 0;
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irq_occur = 0;
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SetPROM_32K_Bank( 0, 1, PROM_8K_SIZE-2, PROM_8K_SIZE-1 );
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SetVROM_4K_Bank( 0, 0 );
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SetVROM_4K_Bank( 4, VROM_4K_SIZE-1 );
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DWORD crc = nes->rom->GetPROM_CRC();
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if( crc == 0x7f2a04bf ) { // For Fantasy Zone 2(J)
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nes->SetRenderMethod( NES::PRE_ALL_RENDER );
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}
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}
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void Mapper067::Write( WORD addr, BYTE data )
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{
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switch( addr & 0xF800 ) {
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case 0x8800:
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SetVROM_2K_Bank( 0, data );
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break;
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case 0x9800:
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SetVROM_2K_Bank( 2, data );
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break;
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case 0xA800:
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SetVROM_2K_Bank( 4, data );
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break;
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case 0xB800:
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SetVROM_2K_Bank( 6, data );
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break;
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case 0xC800:
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if( !irq_toggle ) {
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irq_counter = (irq_counter&0x00FF)|((INT)data<<8);
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} else {
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irq_counter = (irq_counter&0xFF00)|((INT)data&0xFF);
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}
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irq_toggle ^= 1;
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irq_occur = 0;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0xD800:
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irq_enable = data & 0x10;
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irq_toggle = 0;
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irq_occur = 0;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0xE800:
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data &= 0x03;
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if( data == 0 ) SetVRAM_Mirror( VRAM_VMIRROR );
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else if( data == 1 ) SetVRAM_Mirror( VRAM_HMIRROR );
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else if( data == 2 ) SetVRAM_Mirror( VRAM_MIRROR4L );
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else SetVRAM_Mirror( VRAM_MIRROR4H );
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break;
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case 0xF800:
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SetPROM_16K_Bank( 4, data );
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break;
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}
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}
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void Mapper067::Clock( INT cycles )
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{
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if( irq_enable ) {
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if( (irq_counter -= cycles) <= 0 ) {
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irq_enable = 0;
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irq_occur = 0xFF;
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irq_counter = 0xFFFF;
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nes->cpu->SetIRQ( IRQ_MAPPER );
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}
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}
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// if( irq_occur ) {
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// nes->cpu->IRQ_NotPending();
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// }
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}
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void Mapper067::SaveState( LPBYTE p )
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{
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p[0] = irq_enable;
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p[1] = irq_occur;
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p[2] = irq_toggle;
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*((INT*)&p[3]) = irq_counter;
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}
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void Mapper067::LoadState( LPBYTE p )
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{
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irq_enable = p[0];
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irq_occur = p[1];
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irq_toggle = p[2];
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irq_counter = *((INT*)&p[3]);
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}
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