////////////////////////////////////////////////////////////////////////// // Mapper199 WaiXingTypeG Base ON Nintendo MMC3 // ////////////////////////////////////////////////////////////////////////// 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 Mapper199 : Mapper { BYTE[] reg = new byte[8]; BYTE[] prg = new byte[4]; BYTE[] chr = new byte[8]; BYTE we_sram; BYTE JMaddr; BYTE[] JMaddrDAT = new BYTE[3]; BYTE irq_enable; BYTE irq_counter; BYTE irq_latch; BYTE irq_request; public Mapper199(NES parent) : base(parent) { } public override void Reset() { for (byte i = 0; i < 8; i++) { reg[i] = 0x00; chr[i] = i; } prg[0] = 0x00; prg[1] = 0x01; prg[2] = (byte)(PROM_8K_SIZE - 2); prg[3] = (byte)(PROM_8K_SIZE - 1); SetBank_CPU(); SetBank_PPU(); irq_enable = irq_counter = irq_latch = irq_request = 0; JMaddr = 0; JMaddrDAT[0] = JMaddrDAT[1] = JMaddrDAT[2] = 0; we_sram = 0; nes.SetSAVERAM_SIZE(32 * 1024); nes.SetVideoMode(true); } //BYTE Mapper199::ReadLow(WORD addr) public override byte ReadLow(ushort addr) { if (addr >= 0x5000 && addr <= 0x5FFF) { return XRAM[addr - 0x4000]; } else if (addr >= 0x6000 && addr <= 0x7FFF) { if (JMaddr != 0) { switch (addr) { case 0x6000: return JMaddrDAT[0]; case 0x6010: return JMaddrDAT[1]; case 0x6013: JMaddr = 0; return JMaddrDAT[2]; } } switch (we_sram) { case 0xE4: case 0xEC: return WRAM[(addr & 0x1FFF) + 0x0000]; case 0xE5: case 0xED: return WRAM[(addr & 0x1FFF) + 0x2000]; case 0xE6: case 0xEE: return WRAM[(addr & 0x1FFF) + 0x4000]; case 0xE7: case 0xEF: return WRAM[(addr & 0x1FFF) + 0x6000]; default: return CPU_MEM_BANK[addr >> 13][addr & 0x1FFF]; } } else { return base.ReadLow(addr); } } //void Mapper199::WriteLow(WORD addr, BYTE data) public override void WriteLow(ushort addr, byte data) { if (addr >= 0x5000 && addr <= 0x5FFF) { XRAM[addr - 0x4000] = data; if ((we_sram == 0xA1) || (we_sram == 0xA5) || (we_sram == 0xA9)) { JMaddr = 1; switch (addr) { case 0x5000: JMaddrDAT[0] = data; break; case 0x5010: JMaddrDAT[1] = data; break; case 0x5013: JMaddrDAT[2] = data; break; } } } else if (addr >= 0x6000 && addr <= 0x7FFF) { switch (we_sram) { case 0xE4: //CPU_MEM_BANK case 0xEC: //CPU_MEM_BANK WRAM[(addr & 0x1FFF) + 0x0000] = data; CPU_MEM_BANK[addr >> 13][addr & 0x1FFF] = data; break; case 0xE5: //SRAM case 0xED: //SRAM WRAM[(addr & 0x1FFF) + 0x2000] = data; break; case 0xE6: case 0xEE: WRAM[(addr & 0x1FFF) + 0x4000] = data; break; case 0xE7: case 0xEF: WRAM[(addr & 0x1FFF) + 0x6000] = data; break; default: CPU_MEM_BANK[addr >> 13][addr & 0x1FFF] = data; break; } } else { base.WriteLow(addr, data); } } //void Mapper199::Write(WORD addr, BYTE data) public override void Write(ushort addr, byte data) { switch (addr & 0xE001) { case 0x8000: reg[0] = data; SetBank_CPU(); SetBank_PPU(); break; case 0x8001: reg[1] = data; switch (reg[0] & 0x0f) { case 0x00: chr[0] = data; SetBank_PPU(); break; case 0x01: chr[2] = data; SetBank_PPU(); break; case 0x02: case 0x03: case 0x04: case 0x05: chr[(reg[0] & 0x07) + 2] = data; SetBank_PPU(); break; case 0x06: case 0x07: case 0x08: case 0x09: prg[(reg[0] & 0x0f) - 6] = data; SetBank_CPU(); break; case 0x0A: chr[1] = data; SetBank_PPU(); break; case 0x0B: chr[3] = data; SetBank_PPU(); break; } break; case 0xA000: reg[2] = data; data &= 0x03; if (data == 0) SetVRAM_Mirror(VRAM_VMIRROR); else if (data == 1) SetVRAM_Mirror(VRAM_HMIRROR); else if (data == 2) SetVRAM_Mirror(VRAM_MIRROR4L); else SetVRAM_Mirror(VRAM_MIRROR4H); break; case 0xA001: // DEBUGOUT( "MPRWR A=%04X D=%02X L=%3d CYC=%d\n", addr&0xFFFF, data&0xFF, nes->GetScanline(), nes->cpu->GetTotalCycles() ); reg[3] = data; we_sram = data; break; case 0xC000: reg[4] = data; irq_counter = data; irq_request = 0; break; case 0xC001: reg[5] = data; irq_latch = data; irq_request = 0; break; case 0xE000: reg[6] = data; irq_enable = 0; irq_request = 0; nes.cpu.ClrIRQ(IRQ_MAPPER); break; case 0xE001: reg[7] = data; irq_enable = 1; irq_request = 0; break; } } //void Mapper199::HSync(INT scanline) public override void HSync(int scanline) { if ((scanline >= 0 && scanline <= 239)) { if (nes.ppu.IsDispON()) { if (irq_enable != 0 && irq_request == 0) { if (scanline == 0) { if (irq_counter != 0) { irq_counter -= 1; } } if (irq_counter == 0) { irq_request = 0xFF; irq_counter = irq_latch; nes.cpu.SetIRQ(IRQ_MAPPER); } irq_counter--; } } } } void SetBank_CPU() { SetPROM_8K_Bank(4, prg[0 ^ (reg[0] >> 5 & ~(0 << 1) & 2)]); SetPROM_8K_Bank(5, prg[1 ^ (reg[0] >> 5 & ~(1 << 1) & 2)]); SetPROM_8K_Bank(6, prg[2 ^ (reg[0] >> 5 & ~(2 << 1) & 2)]); SetPROM_8K_Bank(7, prg[3 ^ (reg[0] >> 5 & ~(3 << 1) & 2)]); } void SetBank_PPU() { uint bank = (uint)((reg[0] & 0x80) >> 5); for (int x = 0; x < 8; x++) { if (chr[x] <= 7) SetCRAM_1K_Bank((byte)(x ^ bank), chr[x]); else SetVROM_1K_Bank((byte)(x ^ bank), chr[x]); } } //void Mapper199::SaveState(LPBYTE p) public override void SaveState(byte[] p) { //for (INT i = 0; i < 8; i++) //{ // p[i] = reg[i]; //} //for (i = 8; i < 12; i++) //{ // p[i] = prg[i]; //} //for (i = 8; i < 20; i++) //{ // p[i] = chr[i]; //} //p[20] = we_sram; //p[21] = JMaddr; //p[22] = JMaddrDAT[0]; //p[23] = JMaddrDAT[1]; //p[24] = JMaddrDAT[2]; //p[25] = irq_enable; //p[26] = irq_counter; //p[27] = irq_latch; //p[28] = irq_request; } //void Mapper199::LoadState(LPBYTE p) public override void LoadState(byte[] p) { //for (INT i = 0; i < 8; i++) //{ // reg[i] = p[i]; //} //for (i = 8; i < 12; i++) //{ // prg[i] = p[i]; //} //for (i = 8; i < 20; i++) //{ // chr[i] = p[i]; //} //we_sram = p[20]; //JMaddr = p[21]; //JMaddrDAT[0] = p[22]; //JMaddrDAT[1] = p[23]; //JMaddrDAT[2] = p[24]; //irq_enable = p[25]; //irq_counter = p[26]; //irq_latch = p[27]; //irq_request = p[28]; } public override bool IsStateSave() { return true; } } }