175 lines
3.3 KiB
C++
175 lines
3.3 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// Mapper085 Konami VRC7 //
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//////////////////////////////////////////////////////////////////////////
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void Mapper085::Reset()
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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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irq_clock = 0;
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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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} else {
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SetCRAM_8K_Bank( 0 );
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}
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#if 0
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// DWORD crc = nes->rom->GetPROM_CRC();
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// if( crc == 0x1aa0479c ) { // For Tiny Toon Adventures 2 - Montana Land he Youkoso(J)
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// nes->SetRenderMethod( NES::PRE_RENDER );
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// }
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// if( crc == 0x33ce3ff0 ) { // For Lagrange Point(J)
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// nes->SetRenderMethod( NES::TILE_RENDER );
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// }
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#endif
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nes->apu->SelectExSound( 2 );
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}
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void Mapper085::Write( WORD addr, BYTE data )
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{
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switch( addr & 0xF038 ) {
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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 0x8008:
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case 0x8010:
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SetPROM_8K_Bank( 5, data );
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break;
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case 0x9000:
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SetPROM_8K_Bank( 6, data );
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break;
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case 0x9010:
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case 0x9030:
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nes->apu->ExWrite( addr, data );
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break;
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case 0xA000:
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if( VROM_1K_SIZE ) {
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SetVROM_1K_Bank( 0, data );
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} else {
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SetCRAM_1K_Bank( 0, data );
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}
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break;
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case 0xA008:
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case 0xA010:
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if( VROM_1K_SIZE ) {
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SetVROM_1K_Bank( 1, data );
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} else {
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SetCRAM_1K_Bank( 1, data );
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}
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break;
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case 0xB000:
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if( VROM_1K_SIZE ) {
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SetVROM_1K_Bank( 2, data );
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} else {
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SetCRAM_1K_Bank( 2, data );
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}
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break;
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case 0xB008:
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case 0xB010:
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if( VROM_1K_SIZE ) {
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SetVROM_1K_Bank( 3, data );
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} else {
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SetCRAM_1K_Bank( 3, data );
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}
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break;
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case 0xC000:
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if( VROM_1K_SIZE ) {
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SetVROM_1K_Bank( 4, data );
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} else {
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SetCRAM_1K_Bank( 4, data );
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}
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break;
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case 0xC008:
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case 0xC010:
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if( VROM_1K_SIZE ) {
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SetVROM_1K_Bank( 5, data );
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} else {
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SetCRAM_1K_Bank( 5, data );
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}
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break;
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case 0xD000:
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if( VROM_1K_SIZE ) {
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SetVROM_1K_Bank( 6, data );
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} else {
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SetCRAM_1K_Bank( 6, data );
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}
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break;
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case 0xD008:
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case 0xD010:
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if( VROM_1K_SIZE ) {
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SetVROM_1K_Bank( 7, data );
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} else {
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SetCRAM_1K_Bank( 7, data );
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}
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break;
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case 0xE000:
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data &= 0x03;
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if( data == 0 ) SetVRAM_Mirror( VRAM_VMIRROR );
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else if( data == 1 ) SetVRAM_Mirror( VRAM_HMIRROR );
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else if( data == 2 ) SetVRAM_Mirror( VRAM_MIRROR4L );
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else SetVRAM_Mirror( VRAM_MIRROR4H );
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break;
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case 0xE008:
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case 0xE010:
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irq_latch = data;
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break;
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case 0xF000:
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irq_enable = data & 0x03;
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irq_counter = irq_latch;
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irq_clock = 0;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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case 0xF008:
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case 0xF010:
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irq_enable = (irq_enable & 0x01) * 3;
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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}
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}
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void Mapper085::Clock( INT cycles )
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{
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if( irq_enable & 0x02 ) {
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irq_clock += cycles*4;
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while( irq_clock >= 455 ) {
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irq_clock -= 455;
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irq_counter++;
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if( irq_counter == 0 ) {
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irq_counter = irq_latch;
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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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}
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void Mapper085::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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*((INT*)&p[4]) = irq_clock;
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}
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void Mapper085::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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irq_clock = *((INT*)&p[4]);
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}
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