168 lines
7.2 KiB
C++
168 lines
7.2 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper160 PC-Aladdin //
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//////////////////////////////////////////////////////////////////////////
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void Mapper160::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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irq_enable = 0;
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irq_counter = 0;
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irq_latch = 0;
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refresh_type = 0;
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}
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void Mapper160::Write( WORD addr, BYTE data )
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{
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switch( addr ) {
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case 0x8000:
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SetPROM_8K_Bank( 4, data );
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break;
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case 0x8001:
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SetPROM_8K_Bank( 5, data );
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break;
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case 0x8002:
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SetPROM_8K_Bank( 6, data );
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break;
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case 0x9000:
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if( data == 0x2B ) {
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refresh_type = 1;
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} else if( data == 0xA8 ) {
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refresh_type = 2;
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} else if( data == 0x1F ) {
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refresh_type = 3;
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} else if( data == 0x7C ) {
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refresh_type = 4;
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} else if( data == 0x18 ) {
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refresh_type = 5;
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} else if( data == 0x60 ) {
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refresh_type = 6;
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} else {
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refresh_type = 0;
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}
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SetVROM_1K_Bank( 0, data );
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break;
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case 0x9001:
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SetVROM_1K_Bank( 1, data );
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break;
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case 0x9002:
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if( refresh_type == 2 && data != 0xE8 ) {
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refresh_type = 0;
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}
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SetVROM_1K_Bank( 2, data );
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break;
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case 0x9003:
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SetVROM_1K_Bank( 3, data );
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break;
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case 0x9004:
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SetVROM_1K_Bank( 4, data );
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break;
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case 0x9005:
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SetVROM_1K_Bank( 5, data );
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break;
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case 0x9006:
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SetVROM_1K_Bank( 6, data );
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break;
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case 0x9007:
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SetVROM_1K_Bank( 7, data );
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break;
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case 0xC000:
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irq_counter = irq_latch;
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irq_enable = irq_latch;
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break;
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case 0xC001:
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irq_latch = data;
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break;
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case 0xC002:
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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 0xC003:
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irq_counter = data;
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break;
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}
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}
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void Mapper160::HSync( INT scanline )
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{
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if( scanline == 0 || scanline == 239 ) {
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switch( refresh_type ) {
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case 1:
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SetVROM_8K_Bank(0x58,0x59,0x5A,0x5B,0x58,0x59,0x5A,0x5B);
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break;
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case 2:
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SetVROM_8K_Bank(0x78,0x79,0x7A,0x7B,0x78,0x79,0x7A,0x7B);
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break;
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case 3:
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SetVROM_8K_Bank(0x7C,0x7D,0x7E,0x7F,0x7C,0x7D,0x7E,0x7F);
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break;
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case 5:
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SetVROM_8K_Bank(0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77);
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break;
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case 6:
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SetVROM_8K_Bank(0x5C,0x5D,0x5E,0x5F,0x7C,0x7D,0x7E,0x7F);
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break;
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}
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}
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if( scanline == 64 ) {
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if( refresh_type == 4 ) {
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if( PPU_MEM_BANK[8][32*10+16] == 0x0A ) {
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SetVROM_1K_Bank( 0, 0x68 );
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SetVROM_1K_Bank( 1, 0x69 );
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SetVROM_1K_Bank( 2, 0x6A );
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SetVROM_1K_Bank( 3, 0x6B );
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} else {
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SetVROM_1K_Bank( 0, 0x6C );
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SetVROM_1K_Bank( 1, 0x6D );
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SetVROM_1K_Bank( 2, 0x6E );
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SetVROM_1K_Bank( 3, 0x6F );
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}
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}
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}
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if( scanline == 128 ) {
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if( refresh_type == 4 ) {
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SetVROM_1K_Bank( 0, 0x68 );
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SetVROM_1K_Bank( 1, 0x69 );
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SetVROM_1K_Bank( 2, 0x6A );
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SetVROM_1K_Bank( 3, 0x6B );
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} else if( refresh_type == 5 ) {
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SetVROM_8K_Bank(0x74,0x75,0x76,0x77,0x74,0x75,0x76,0x77);
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}
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}
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if( scanline == 160 ) {
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if( refresh_type == 6 ) {
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SetVROM_8K_Bank(0x60,0x61,0x5E,0x5F,0x7C,0x7D,0x7E,0x7F);
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}
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}
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if( irq_enable ) {
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if( irq_counter == 0xFF ) {
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// nes->cpu->IRQ_NotPending();
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irq_enable = 0;
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irq_counter = 0;
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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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void Mapper160::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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p[3] = refresh_type;
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}
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void Mapper160::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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refresh_type = p[3];
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}
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