130 lines
3.7 KiB
C#
130 lines
3.7 KiB
C#
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using Codice.CM.Client.Differences;
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using System;
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namespace VirtualNes.Core
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{
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public class Mapper255 : Mapper
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{
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byte[] reg = new byte[4];
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public Mapper255(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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MMU.SetPROM_32K_Bank(0);
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MMU.SetVROM_8K_Bank(0);
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MMU.SetVRAM_Mirror(MMU.VRAM_VMIRROR);
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reg[0] = 0;
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reg[1] = 0;
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reg[2] = 0;
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reg[3] = 0;
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}
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//BYTE Mapper255::ReadLow(WORD addr, BYTE data)
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//{
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// if (addr >= 0x5800)
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// {
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// return reg[addr & 0x0003] & 0x0F;
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// }
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// else
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// {
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// return addr >> 8;
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// }
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//}
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public override byte ReadLow(ushort addr)
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{
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if (addr >= 0x5800)
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{
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return (byte)(reg[addr & 0x0003] & 0x0F);
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}
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else
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{
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return (byte)(addr >> 8);
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}
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}
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public override void WriteLow(ushort addr, byte data)
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{
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if (addr >= 0x5800)
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{
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reg[addr & 0x0003] = (byte)(data & 0x0F);
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}
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}
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public override void Write(ushort addr, byte data)
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{
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byte prg = (byte)((addr & 0x0F80) >> 7);
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int chr = (byte)((addr & 0x003F));
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int bank = (byte)((addr & 0x4000) >> 14);
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if ((addr & 0x2000) != 0 )
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{
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MMU.SetVRAM_Mirror(MMU.VRAM_HMIRROR);
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}
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else
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{
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MMU.SetVRAM_Mirror(MMU.VRAM_VMIRROR);
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}
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if ((addr & 0x1000) !=0)
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{
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if ((addr & 0x0040) != 0)
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{
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MMU.SetPROM_8K_Bank(4, 0x80 * bank + prg * 4 + 2);
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MMU.SetPROM_8K_Bank(5, 0x80 * bank + prg * 4 + 3);
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MMU.SetPROM_8K_Bank(6, 0x80 * bank + prg * 4 + 2);
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MMU.SetPROM_8K_Bank(7, 0x80 * bank + prg * 4 + 3);
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}
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else
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{
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MMU.SetPROM_8K_Bank(4, 0x80 * bank + prg * 4 + 0);
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MMU.SetPROM_8K_Bank(5, 0x80 * bank + prg * 4 + 1);
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MMU.SetPROM_8K_Bank(6, 0x80 * bank + prg * 4 + 0);
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MMU.SetPROM_8K_Bank(7, 0x80 * bank + prg * 4 + 1);
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}
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}
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else
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{
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MMU.SetPROM_8K_Bank(4, 0x80 * bank + prg * 4 + 0);
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MMU.SetPROM_8K_Bank(5, 0x80 * bank + prg * 4 + 1);
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MMU.SetPROM_8K_Bank(6, 0x80 * bank + prg * 4 + 2);
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MMU.SetPROM_8K_Bank(7, 0x80 * bank + prg * 4 + 3);
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}
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MMU.SetVROM_1K_Bank(0, 0x200 * bank + chr * 8 + 0);
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MMU.SetVROM_1K_Bank(1, 0x200 * bank + chr * 8 + 1);
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MMU.SetVROM_1K_Bank(2, 0x200 * bank + chr * 8 + 2);
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MMU.SetVROM_1K_Bank(3, 0x200 * bank + chr * 8 + 3);
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MMU.SetVROM_1K_Bank(4, 0x200 * bank + chr * 8 + 4);
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MMU.SetVROM_1K_Bank(5, 0x200 * bank + chr * 8 + 5);
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MMU.SetVROM_1K_Bank(6, 0x200 * bank + chr * 8 + 6);
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MMU.SetVROM_1K_Bank(7, 0x200 * bank + chr * 8 + 7);
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}
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// For state save
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public override bool IsStateSave()
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{
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return true;
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}
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public override void SaveState(byte[] p)
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{
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p[0] = reg[0];
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p[1] = reg[1];
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p[2] = reg[2];
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p[3] = reg[3];
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}
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public override void LoadState(byte[] p)
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{
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reg[0] = p[0];
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reg[1] = p[1];
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reg[2] = p[2];
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reg[3] = p[3];
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}
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}
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}
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