////////////////////////////////////////////////////////////// // Mapper245 Yong Zhe Dou E Long // ////////////////////////////////////////////////////////////////////////// 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 Mapper245 : Mapper { BYTE[] reg = new byte[8]; BYTE prg0, prg1; BYTE chr01, chr23, chr4, chr5, chr6, chr7; BYTE we_sram; BYTE irq_type; BYTE irq_enable; BYTE irq_counter; BYTE irq_latch; BYTE irq_request; int MMC4prg, MMC4chr; public Mapper245(NES parent) : base(parent) { } //void Mapper245::Reset() public override void Reset() { for (INT i = 0; i < 8; i++) { reg[i] = 0x00; } prg0 = 0; prg1 = 1; SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1); if (VROM_1K_SIZE != 0) { SetVROM_8K_Bank(0); } we_sram = 0; // Disable irq_enable = 0; // Disable irq_counter = 0; irq_latch = 0; irq_request = 0; nes.SetIrqType(NES.IRQMETHOD.IRQ_CLOCK); } //void Mapper245::Write(WORD addr, BYTE data) public override void Write(ushort addr, byte data) { switch (addr & 0xF7FF) { case 0x8000: reg[0] = data; break; case 0x8001: reg[1] = data; switch (reg[0]) { case 0x00: reg[3] = (byte)((data & 2) << 5); SetPROM_8K_Bank(6, 0x3E | reg[3]); SetPROM_8K_Bank(7, 0x3F | reg[3]); break; case 0x06: prg0 = data; break; case 0x07: prg1 = data; break; } SetPROM_8K_Bank(4, prg0 | reg[3]); SetPROM_8K_Bank(5, prg1 | reg[3]); break; case 0xA000: reg[2] = data; if (!nes.rom.Is4SCREEN()) { if ((data & 0x01) != 0) SetVRAM_Mirror(VRAM_HMIRROR); else SetVRAM_Mirror(VRAM_VMIRROR); } break; case 0xA001: break; case 0xC000: reg[4] = data; irq_counter = data; irq_request = 0; nes.cpu.ClrIRQ(IRQ_MAPPER); break; case 0xC001: reg[5] = data; irq_latch = data; irq_request = 0; nes.cpu.ClrIRQ(IRQ_MAPPER); 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; nes.cpu.ClrIRQ(IRQ_MAPPER); break; } } //void Mapper245::Clock(INT cycles) public override void Clock(int cycles) { // if( irq_request && (nes.GetIrqType() == NES::IRQ_CLOCK) ) { // nes.cpu.IRQ_NotPending(); // } } //void Mapper245::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--; } } if ((irq_counter--) == 0) { irq_request = 0xFF; irq_counter = irq_latch; nes.cpu.SetIRQ(IRQ_MAPPER); } } } } // if( irq_request && (nes.GetIrqType() == NES::IRQ_HSYNC) ) { // nes.cpu.IRQ_NotPending(); // } } void SetBank_CPU() { SetPROM_32K_Bank(prg0, prg1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1); } void SetBank_PPU() { if ((VROM_1K_SIZE)!= 0) { if (((reg[0] & 0x80) !+ 0) != 0) { SetVROM_8K_Bank(chr4, chr5, chr6, chr7, chr23 + 1, chr23, chr01 + 1, chr01); } else { SetVROM_8K_Bank(chr01, chr01 + 1, chr23, chr23 + 1, chr4, chr5, chr6, chr7); } } else { if ((reg[0] & 0x80) != 0) { SetCRAM_1K_Bank(4, (chr01 + 0) & 0x07); SetCRAM_1K_Bank(5, (chr01 + 1) & 0x07); SetCRAM_1K_Bank(6, (chr23 + 0) & 0x07); SetCRAM_1K_Bank(7, (chr23 + 1) & 0x07); SetCRAM_1K_Bank(0, chr4 & 0x07); SetCRAM_1K_Bank(1, chr5 & 0x07); SetCRAM_1K_Bank(2, chr6 & 0x07); SetCRAM_1K_Bank(3, chr7 & 0x07); } else { SetCRAM_1K_Bank(0, (chr01 + 0) & 0x07); SetCRAM_1K_Bank(1, (chr01 + 1) & 0x07); SetCRAM_1K_Bank(2, (chr23 + 0) & 0x07); SetCRAM_1K_Bank(3, (chr23 + 1) & 0x07); SetCRAM_1K_Bank(4, chr4 & 0x07); SetCRAM_1K_Bank(5, chr5 & 0x07); SetCRAM_1K_Bank(6, chr6 & 0x07); SetCRAM_1K_Bank(7, chr7 & 0x07); } } } public override bool IsStateSave() { return true; } //void Mapper245::SaveState(LPBYTE p) public override void SaveState(byte[] p) { //for (INT i = 0; i < 8; i++) //{ // p[i] = reg[i]; //} //p[8] = prg0; //p[9] = prg1; //p[10] = chr01; //p[11] = chr23; //p[12] = chr4; //p[13] = chr5; //p[14] = chr6; //p[15] = chr7; //p[16] = irq_enable; //p[17] = (BYTE)irq_counter; //p[18] = irq_latch; //p[19] = irq_request; } //void Mapper245::LoadState(LPBYTE p) public override void LoadState(byte[] p) { //for (INT i = 0; i < 8; i++) //{ // reg[i] = p[i]; //} //prg0 = p[8]; //prg1 = p[9]; //chr01 = p[10]; //chr23 = p[11]; //chr4 = p[12]; //chr5 = p[13]; //chr6 = p[14]; //chr7 = p[15]; //irq_enable = p[16]; //irq_counter = (INT)p[17]; //irq_latch = p[18]; //irq_request = p[19]; } } }