92 lines
1.6 KiB
C++
92 lines
1.6 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper142 SMB2j Pirate (KS 202) //
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//////////////////////////////////////////////////////////////////////////
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void Mapper142::Reset()
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{
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irq_enable = 0;
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irq_counter = 0;
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SetPROM_8K_Bank( 4, 0 );
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SetPROM_8K_Bank( 5, 0 );
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SetPROM_8K_Bank( 6, 0 );
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SetPROM_8K_Bank( 7, 0 );
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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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BYTE Mapper142::ReadLow( WORD addr )
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{
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return CPU_MEM_BANK[addr>>13][addr&0x1FFF];
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}
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void Mapper142::ExWrite( WORD addr, BYTE data )
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{
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if( (addr&0xF0FF) == 0x4022 ) {
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switch( data&0x07 ) {
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case 0x00:
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case 0x02:
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case 0x03:
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case 0x04:
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SetPROM_8K_Bank( 6, 4 );
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break;
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case 0x01:
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SetPROM_8K_Bank( 6, 3 );
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break;
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case 0x05:
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SetPROM_8K_Bank( 6, 7 );
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break;
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case 0x06:
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SetPROM_8K_Bank( 6, 5 );
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break;
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case 0x07:
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SetPROM_8K_Bank( 6, 6 );
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break;
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}
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}
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}
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void Mapper142::WriteLow( WORD addr, BYTE data )
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{
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ExWrite( addr, data );
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}
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void Mapper142::Write( WORD addr, BYTE data )
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{
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if( addr == 0x8122 ) {
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if( data&0x03 ) {
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irq_enable = 1;
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} else {
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irq_counter = 0;
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irq_enable = 0;
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}
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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}
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CPU_MEM_BANK[addr>>13][addr&0x1FFF] = data;
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}
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void Mapper142::HSync( INT scanline )
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{
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if( irq_enable ) {
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irq_counter += 341;
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if( irq_counter >= 12288 ) {
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irq_counter = 0;
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// nes->cpu->IRQ_NotPending();
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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 Mapper142::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 Mapper142::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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