129 lines
2.5 KiB
C++
129 lines
2.5 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper024 Konami VRC6(Normal) //
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//////////////////////////////////////////////////////////////////////////
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void Mapper024::Reset()
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{
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irq_enable = 0;
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irq_counter = 0;
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irq_latch = 0;
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irq_clock = 0;
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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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nes->SetRenderMethod( NES::POST_RENDER );
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// nes->SetRenderMethod( NES::PRE_RENDER );
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nes->apu->SelectExSound( 1 );
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}
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void Mapper024::Write( WORD addr, BYTE data )
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{
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switch( addr & 0xF003 ) {
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case 0x8000:
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SetPROM_16K_Bank( 4, data );
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break;
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case 0x9000: case 0x9001: case 0x9002:
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case 0xA000: case 0xA001: case 0xA002:
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case 0xB000: case 0xB001: case 0xB002:
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nes->apu->ExWrite( addr, data );
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break;
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case 0xB003:
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data = data & 0x0C;
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if( data == 0x00 ) SetVRAM_Mirror( VRAM_VMIRROR );
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else if( data == 0x04 ) SetVRAM_Mirror( VRAM_HMIRROR );
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else if( data == 0x08 ) SetVRAM_Mirror( VRAM_MIRROR4L );
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else if( data == 0x0C ) SetVRAM_Mirror( VRAM_MIRROR4H );
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break;
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case 0xC000:
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SetPROM_8K_Bank( 6, data );
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break;
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case 0xD000:
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SetVROM_1K_Bank( 0, data );
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break;
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case 0xD001:
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SetVROM_1K_Bank( 1, data );
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break;
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case 0xD002:
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SetVROM_1K_Bank( 2, data );
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break;
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case 0xD003:
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SetVROM_1K_Bank( 3, data );
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break;
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case 0xE000:
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SetVROM_1K_Bank( 4, data );
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break;
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case 0xE001:
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SetVROM_1K_Bank( 5, data );
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break;
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case 0xE002:
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SetVROM_1K_Bank( 6, data );
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break;
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case 0xE003:
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SetVROM_1K_Bank( 7, data );
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break;
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case 0xF000:
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irq_latch = data;
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break;
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case 0xF001:
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irq_enable = data & 0x03;
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if( irq_enable & 0x02 ) {
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irq_counter = irq_latch;
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irq_clock = 0;
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}
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0xF002:
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irq_enable = (irq_enable & 0x01) * 3;
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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 Mapper024::Clock( INT cycles )
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{
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if( irq_enable & 0x02 ) {
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if( (irq_clock+=cycles) >= 0x72 ) {
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irq_clock -= 0x72;
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if( irq_counter == 0xFF ) {
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irq_counter = irq_latch;
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// nes->cpu->IRQ_NotPending();
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nes->cpu->SetIRQ( IRQ_MAPPER );
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} else {
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irq_counter++;
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}
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}
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}
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}
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void Mapper024::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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p[2] = irq_latch;
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*(INT*)&p[3] = irq_clock;
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}
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void Mapper024::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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irq_latch = p[2];
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irq_clock = *(INT*)&p[3];
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}
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