58 lines
1.0 KiB
C++
58 lines
1.0 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper040 SMB2J //
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//////////////////////////////////////////////////////////////////////////
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void Mapper040::Reset()
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{
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irq_enable = 0;
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irq_line = 0;
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SetPROM_8K_Bank( 3, 6 );
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SetPROM_32K_Bank( 4, 5, 0, 7 );
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if( VROM_1K_SIZE ) {
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SetVROM_8K_Bank( 0 );
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}
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}
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void Mapper040::Write( WORD addr, BYTE data )
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{
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switch( addr & 0xE000 ) {
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case 0x8000:
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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 0xA000:
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irq_enable = 0xFF;
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irq_line = 37;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0xC000:
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break;
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case 0xE000:
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SetPROM_8K_Bank( 6, data&0x07 );
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break;
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}
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}
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void Mapper040::HSync( INT scanline )
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{
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if( irq_enable ) {
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if( --irq_line <= 0 ) {
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// nes->cpu->IRQ();
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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 Mapper040::SaveState( LPBYTE p )
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{
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p[0] = irq_enable;
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*(INT*)&p[1] = irq_line;
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}
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void Mapper040::LoadState( LPBYTE p )
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{
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irq_enable = p[0];
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irq_line = *(INT*)&p[1];
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}
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