196 lines
5.1 KiB
C#
196 lines
5.1 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper165 Fire Emblem Chinese version //
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//////////////////////////////////////////////////////////////////////////
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using static VirtualNes.MMU;
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using BYTE = System.Byte;
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using INT = System.Int32;
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namespace VirtualNes.Core
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{
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public class Mapper165 : Mapper
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{
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BYTE[] reg = new byte[8];
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BYTE prg0, prg1;
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BYTE chr0, chr1, chr2, chr3;
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BYTE we_sram;
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BYTE latch;
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public Mapper165(NES parent) : base(parent)
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{
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}
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public override void Reset()
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{
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for (INT i = 0; i < 8; i++)
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{
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reg[i] = 0x00;
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}
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prg0 = 0;
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prg1 = 1;
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SetBank_CPU();
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chr0 = 0;
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chr1 = 0;
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chr2 = 4;
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chr3 = 4;
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latch = 0xFD;
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SetBank_PPU();
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we_sram = 0; // Disable
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nes.ppu.SetChrLatchMode(true);
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}
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//void Mapper165::Write(WORD addr, BYTE data)
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public override void Write(ushort addr, byte data)
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{
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switch (addr & 0xE001)
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{
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case 0x8000:
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reg[0] = data;
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SetBank_CPU();
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SetBank_PPU();
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break;
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case 0x8001:
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reg[1] = data;
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switch (reg[0] & 0x07)
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{
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case 0x00:
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chr0 = (byte)(data & 0xFC);
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if (latch == 0xFD)
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SetBank_PPU();
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break;
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case 0x01:
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chr1 = (byte)(data & 0xFC);
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if (latch == 0xFE)
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SetBank_PPU();
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break;
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case 0x02:
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chr2 = (byte)(data & 0xFC);
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if (latch == 0xFD)
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SetBank_PPU();
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break;
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case 0x04:
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chr3 = (byte)(data & 0xFC);
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if (latch == 0xFE)
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SetBank_PPU();
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break;
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case 0x06:
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prg0 = data;
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SetBank_CPU();
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break;
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case 0x07:
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prg1 = data;
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SetBank_CPU();
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break;
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}
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break;
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case 0xA000:
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reg[2] = data;
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if ((data & 0x01) != 0)
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{
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SetVRAM_Mirror(VRAM_HMIRROR);
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}
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else
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{
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SetVRAM_Mirror(VRAM_VMIRROR);
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}
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break;
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case 0xA001:
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reg[3] = data;
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break;
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default:
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break;
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}
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}
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void SetBank_CPU()
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{
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SetPROM_32K_Bank(prg0, prg1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
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}
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void SetBank_PPU()
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{
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if (latch == 0xFD)
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{
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SetBank_PPUSUB(0, chr0);
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SetBank_PPUSUB(4, chr2);
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}
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else
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{
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SetBank_PPUSUB(0, chr1);
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SetBank_PPUSUB(4, chr3);
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}
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}
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void SetBank_PPUSUB(int bank, int page)
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{
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if (page == 0)
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{
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SetCRAM_4K_Bank((byte)bank, page >> 2);
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}
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else
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{
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SetVROM_4K_Bank((byte)bank, page >> 2);
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}
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}
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//void Mapper165::PPU_ChrLatch(WORD addr)
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public override void PPU_ChrLatch(ushort addr)
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{
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ushort mask = (ushort)(addr & 0x1FF0);
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if (mask == 0x1FD0)
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{
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latch = 0xFD;
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SetBank_PPU();
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}
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else if (mask == 0x1FE0)
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{
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latch = 0xFE;
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SetBank_PPU();
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}
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}
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//void Mapper165::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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for (INT i = 0; i < 8; i++)
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{
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p[i] = reg[i];
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}
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p[8] = prg0;
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p[9] = prg1;
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p[10] = chr0;
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p[11] = chr1;
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p[12] = chr2;
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p[13] = chr3;
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p[14] = latch;
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}
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//void Mapper165::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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for (INT i = 0; i < 8; i++)
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{
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reg[i] = p[i];
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}
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prg0 = p[8];
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prg1 = p[9];
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chr0 = p[10];
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chr1 = p[11];
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chr2 = p[12];
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chr3 = p[13];
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latch = p[14];
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}
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}
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}
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