103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
//////////////////////////////////////////////////////////////////////////
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// BoardCityFighter //
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//////////////////////////////////////////////////////////////////////////
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void BoardCityFighter::Reset()
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{
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for(int n=0;n<8;n++) chr_reg[n] = 0x00;
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prg_reg = 0;
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prg_mode = 0;
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mirr = 0;
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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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SetBank();
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}
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void BoardCityFighter::Write( WORD addr, BYTE data )
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{
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switch (addr & 0xF00C) {
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case 0x9000: prg_reg = data & 0xC; mirr = data & 3; break;
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case 0x9004:
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case 0x9008:
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case 0x900C:
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if (addr & 0x800)
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nes->apu->Write(0x4011,(data&0xf)<<3);
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else
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prg_reg = data & 0xC;
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break;
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case 0xC000:
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case 0xC004:
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case 0xC008:
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case 0xC00C: prg_mode = data & 1; break;
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case 0xD000: chr_reg[0] = (chr_reg[0] & 0xF0) | (data & 0x0F); break;
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case 0xD004: chr_reg[0] = (chr_reg[0] & 0x0F) | (data << 4); break;
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case 0xD008: chr_reg[1] = (chr_reg[1] & 0xF0) | (data & 0x0F); break;
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case 0xD00C: chr_reg[1] = (chr_reg[1] & 0x0F) | (data << 4); break;
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case 0xA000: chr_reg[2] = (chr_reg[2] & 0xF0) | (data & 0x0F); break;
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case 0xA004: chr_reg[2] = (chr_reg[2] & 0x0F) | (data << 4); break;
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case 0xA008: chr_reg[3] = (chr_reg[3] & 0xF0) | (data & 0x0F); break;
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case 0xA00C: chr_reg[3] = (chr_reg[3] & 0x0F) | (data << 4); break;
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case 0xB000: chr_reg[4] = (chr_reg[4] & 0xF0) | (data & 0x0F); break;
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case 0xB004: chr_reg[4] = (chr_reg[4] & 0x0F) | (data << 4); break;
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case 0xB008: chr_reg[5] = (chr_reg[5] & 0xF0) | (data & 0x0F); break;
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case 0xB00C: chr_reg[5] = (chr_reg[5] & 0x0F) | (data << 4); break;
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case 0xE000: chr_reg[6] = (chr_reg[6] & 0xF0) | (data & 0x0F); break;
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case 0xE004: chr_reg[6] = (chr_reg[6] & 0x0F) | (data << 4); break;
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case 0xE008: chr_reg[7] = (chr_reg[7] & 0xF0) | (data & 0x0F); break;
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case 0xE00C: chr_reg[7] = (chr_reg[7] & 0x0F) | (data << 4); break;
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case 0xF000: irq_latch = (irq_latch & 0xF0) | (data & 0x0F); break;
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case 0xF004: irq_latch = (irq_latch & 0x0F) | ((data & 0x0F) << 4); break;
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case 0xF008:
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irq_enable = data & 0x03;
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if( irq_enable & 0x02 ) {
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irq_counter = irq_latch;
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irq_clock = 0;
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}
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nes->cpu->ClrIRQ( IRQ_MAPPER );
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break;
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default:
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break;
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}
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SetBank();
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}
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void BoardCityFighter::SetBank()
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{
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SetPROM_32K_Bank( prg_reg >> 2 );
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if (!prg_mode) SetPROM_8K_Bank(6, prg_reg);
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for (int i = 0; i < 8; i++) SetVROM_1K_Bank(i, chr_reg[i]);
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switch (mirr) {
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case 0: SetVRAM_Mirror( VRAM_VMIRROR ); break;
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case 1: SetVRAM_Mirror( VRAM_HMIRROR ); break;
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case 2: SetVRAM_Mirror( VRAM_MIRROR4L ); break;
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case 3: SetVRAM_Mirror( VRAM_MIRROR4H ); break;
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}
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}
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void BoardCityFighter::Clock( INT cycles )
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{
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if( irq_enable & 0x02 ) {
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if( (irq_clock+=cycles) >= 0x72 ) {
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irq_clock -= 0x72;
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if( irq_counter == 0xFF ) {
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irq_counter = irq_latch;
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irq_enable = (irq_enable & 0x01) * 3;
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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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}
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void BoardCityFighter::SaveState( LPBYTE p )
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{
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//
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}
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void BoardCityFighter::LoadState( LPBYTE p )
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{
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//
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}
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