////////////////////////////////////////////////////////////////////////// // Mapper187 Street Fighter Zero 2 97 // ////////////////////////////////////////////////////////////////////////// using static VirtualNes.MMU; using static VirtualNes.Core.CPU; using INT = System.Int32; using BYTE = System.Byte; using System; //using Codice.CM.Client.Differences; namespace VirtualNes.Core { public class Mapper187 : Mapper { BYTE[] prg = new byte[4]; INT[] chr = new int[8]; BYTE[] bank = new byte[8]; BYTE ext_mode; BYTE chr_mode; BYTE ext_enable; BYTE irq_enable; BYTE irq_counter; BYTE irq_latch; BYTE irq_occur; BYTE last_write; public Mapper187(NES parent) : base(parent) { } public override void Reset() { INT i; for (i = 0; i < 8; i++) { chr[i] = 0x00; bank[i] = 0x00; } prg[0] = (byte)(PROM_8K_SIZE - 4); prg[1] = (byte)(PROM_8K_SIZE - 3); prg[2] = (byte)(PROM_8K_SIZE - 2); prg[3] = (byte)(PROM_8K_SIZE - 1); SetBank_CPU(); ext_mode = 0; chr_mode = 0; ext_enable = 0; irq_enable = 0; irq_counter = 0; irq_latch = 0; last_write = 0; nes.SetRenderMethod(EnumRenderMethod.POST_ALL_RENDER); } //BYTE Mapper187::ReadLow(WORD addr) public override byte ReadLow(ushort addr) { switch (last_write & 0x03) { case 0: return 0x83; case 1: return 0x83; case 2: return 0x42; case 3: return 0x00; } return 0; } //void Mapper187::WriteLow(WORD addr, BYTE data) public override void WriteLow(ushort addr, byte data) { last_write = data; if (addr == 0x5000) { ext_mode = data; if ((data & 0x80) != 0) { if ((data & 0x20) != 0) { prg[0] = (byte)(((data & 0x1E) << 1) + 0); prg[1] = (byte)(((data & 0x1E) << 1) + 1); prg[2] = (byte)(((data & 0x1E) << 1) + 2); prg[3] = (byte)(((data & 0x1E) << 1) + 3); } else { prg[2] = (byte)(((data & 0x1F) << 1) + 0); prg[3] = (byte)(((data & 0x1F) << 1) + 1); } } else { prg[0] = bank[6]; prg[1] = bank[7]; prg[2] = (byte)(PROM_8K_SIZE - 2); prg[3] = (byte)(PROM_8K_SIZE - 1); } SetBank_CPU(); } } //void Mapper187::Write(WORD addr, BYTE data) public override void Write(ushort addr, byte data) { last_write = data; switch (addr) { case 0x8003: ext_enable = 0xFF; // if( (data&0x80) != (chr_mode&0x80) ) { // for( INT i = 0; i < 4; i++ ) { // INT temp = chr[i]; // chr[i] = chr[i+4]; // chr[i+4] = temp; // } // SetBank_PPU(); // } chr_mode = data; if ((data & 0xF0) == 0) { prg[2] = (byte)(PROM_8K_SIZE - 2); SetBank_CPU(); } break; case 0x8000: ext_enable = 0; // if( (data&0x80) != (chr_mode&0x80) ) { // for( INT i = 0; i < 4; i++ ) { // INT temp = chr[i]; // chr[i] = chr[i+4]; // chr[i+4] = temp; // } // SetBank_PPU(); // } chr_mode = data; break; case 0x8001: if (ext_enable == 0) { switch (chr_mode & 7) { case 0: data &= 0xFE; chr[4] = (INT)data + 0x100; chr[5] = (INT)data + 0x100 + 1; // chr[0+((chr_mode&0x80)?4:0)] = data; // chr[1+((chr_mode&0x80)?4:0)] = data+1; SetBank_PPU(); break; case 1: data &= 0xFE; chr[6] = (INT)data + 0x100; chr[7] = (INT)data + 0x100 + 1; // chr[2+((chr_mode&0x80)?4:0)] = data; // chr[3+((chr_mode&0x80)?4:0)] = data+1; SetBank_PPU(); break; case 2: chr[0] = data; // chr[0+((chr_mode&0x80)?0:4)] = data; SetBank_PPU(); break; case 3: chr[1] = data; // chr[1+((chr_mode&0x80)?0:4)] = data; SetBank_PPU(); break; case 4: chr[2] = data; // chr[2+((chr_mode&0x80)?0:4)] = data; SetBank_PPU(); break; case 5: chr[3] = data; // chr[3+((chr_mode&0x80)?0:4)] = data; SetBank_PPU(); break; case 6: if ((ext_mode & 0xA0) != 0xA0) { prg[0] = data; SetBank_CPU(); } break; case 7: if ((ext_mode & 0xA0) != 0xA0) { prg[1] = data; SetBank_CPU(); } break; default: break; } } else { switch (chr_mode) { case 0x2A: prg[1] = 0x0F; break; case 0x28: prg[2] = 0x17; break; case 0x26: break; default: break; } SetBank_CPU(); } bank[chr_mode & 7] = data; break; case 0xA000: if ((data & 0x01) != 0) { SetVRAM_Mirror(VRAM_HMIRROR); } else { SetVRAM_Mirror(VRAM_VMIRROR); } break; case 0xA001: break; case 0xC000: irq_counter = data; irq_occur = 0; nes.cpu.ClrIRQ(IRQ_MAPPER); break; case 0xC001: irq_latch = data; irq_occur = 0; nes.cpu.ClrIRQ(IRQ_MAPPER); break; case 0xE000: case 0xE002: irq_enable = 0; irq_occur = 0; nes.cpu.ClrIRQ(IRQ_MAPPER); break; case 0xE001: case 0xE003: irq_enable = 1; irq_occur = 0; nes.cpu.ClrIRQ(IRQ_MAPPER); break; } } //void Mapper187::Clock(INT cycles) public override void Clock(int cycles) { // if( irq_occur ) { // nes.cpu.IRQ_NotPending(); // } } // void Mapper187::HSync(INT scanline) public override void HSync(int scanline) { if ((scanline >= 0 && scanline <= 239)) { if (nes.ppu.IsDispON()) { if (irq_enable != 0) { if (irq_counter == 0) { irq_counter--; irq_enable = 0; irq_occur = 0xFF; nes.cpu.SetIRQ(IRQ_MAPPER); } else { irq_counter--; } } } } } void SetBank_CPU() { SetPROM_32K_Bank(prg[0], prg[1], prg[2], prg[3]); } void SetBank_PPU() { SetVROM_8K_Bank(chr[0], chr[1], chr[2], chr[3], chr[4], chr[5], chr[6], chr[7]); } //void Mapper187::SaveState(LPBYTE p) public override void SaveState(byte[] p) { //INT i; //for (i = 0; i < 4; i++) //{ // p[i] = prg[i]; //} //for (i = 0; i < 8; i++) //{ // p[4 + i] = bank[i]; //} //for (i = 0; i < 8; i++) //{ // *((INT*)&p[12 + i * sizeof(INT)]) = chr[i]; //} //p[44] = ext_mode; //p[45] = chr_mode; //p[46] = ext_enable; //p[47] = irq_enable; //p[48] = irq_counter; //p[49] = irq_latch; //p[50] = irq_occur; //p[51] = last_write; } //void Mapper187::LoadState(LPBYTE p) public override void LoadState(byte[] p) { //INT i; //for (i = 0; i < 4; i++) //{ // prg[i] = p[i]; //} //for (i = 0; i < 8; i++) //{ // bank[i] = p[4 + i]; //} //for (i = 0; i < 8; i++) //{ // chr[i] = *((INT*)&p[12 + i * sizeof(INT)]); //} //ext_mode = p[44]; //chr_mode = p[45]; //ext_enable = p[46]; //irq_enable = p[47]; //irq_counter = p[48]; //irq_latch = p[49]; //irq_occur = p[50]; //last_write = p[51]; } public override bool IsStateSave() { return true; } } }