80 lines
3.2 KiB
C++
80 lines
3.2 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper006 FFE F4xxx //
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//////////////////////////////////////////////////////////////////////////
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void Mapper006::Reset()
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{
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SetPROM_32K_Bank( 0, 1, 14, 15 );
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if( VROM_1K_SIZE ) {
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SetVROM_8K_Bank( 0 );
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} else {
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SetCRAM_8K_Bank( 0 );
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}
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irq_enable = 0;
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irq_counter = 0;
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}
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void Mapper006::WriteLow( WORD addr, BYTE data )
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{
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switch( addr ) {
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case 0x42FE:
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if( data&0x10 ) SetVRAM_Mirror( VRAM_MIRROR4H );
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else SetVRAM_Mirror( VRAM_MIRROR4L );
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break;
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case 0x42FF:
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if( data&0x10 ) SetVRAM_Mirror( VRAM_HMIRROR );
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else SetVRAM_Mirror( VRAM_VMIRROR );
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break;
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case 0x4501:
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irq_enable = 0;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0x4502:
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irq_counter = (irq_counter&0xFF00)|data;
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break;
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case 0x4503:
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irq_counter = (irq_counter&0x00FF)|((INT)data<<8);
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irq_enable = 0xFF;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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default:
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Mapper::WriteLow( addr, data );
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break;
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}
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}
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void Mapper006::Write( WORD addr, BYTE data )
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{
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SetPROM_16K_Bank( 4, (data&0x3C)>>2 );
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SetCRAM_8K_Bank( data&0x03 );
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}
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void Mapper006::HSync( INT scanline )
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{
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if( irq_enable ) {
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irq_counter+=133;
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if( irq_counter >= 0xFFFF ) {
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// nes->cpu->IRQ();
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irq_counter = 0;
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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 Mapper006::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 Mapper006::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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