94 lines
3.8 KiB
C++
94 lines
3.8 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper017 FFE F8xxx //
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//////////////////////////////////////////////////////////////////////////
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void Mapper017::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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irq_enable = 0;
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irq_counter = 0;
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irq_latch = 0;
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}
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void Mapper017::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_latch = (irq_latch&0xFF00)|data;
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break;
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case 0x4503:
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irq_latch = (irq_latch&0x00FF)|((INT)data<<8);
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irq_counter = irq_latch;
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irq_enable = 0xFF;
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break;
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case 0x4504:
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case 0x4505:
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case 0x4506:
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case 0x4507:
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SetPROM_8K_Bank( addr&0x07, data );
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break;
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case 0x4510:
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case 0x4511:
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case 0x4512:
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case 0x4513:
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case 0x4514:
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case 0x4515:
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case 0x4516:
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case 0x4517:
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SetVROM_1K_Bank( addr&0x07, data );
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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 Mapper017::HSync( INT scanline )
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{
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if( irq_enable ) {
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if( irq_counter >= 0xFFFF-113 ) {
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nes->cpu->SetIRQ( IRQ_MAPPER );
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// nes->cpu->IRQ();
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// irq_counter = 0;
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// irq_enable = 0;
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irq_counter &= 0xFFFF;
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} else {
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irq_counter += 113;
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}
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}
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}
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void Mapper017::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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*(INT*)&p[5] = irq_latch;
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}
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void Mapper017::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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irq_latch = *(INT*)&p[5];
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}
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