AxibugEmuOnline/AxibugEmuOnline.Client/Assets/MyNes.Core/Mapper206.cs
2024-07-03 18:22:22 +08:00

132 lines
3.3 KiB
C#

using System.IO;
namespace MyNes.Core
{
[BoardInfo("Unknown", 206)]
internal class Mapper206 : Board
{
private bool flag_c;
private bool flag_p;
private int address_8001;
private int[] chr_reg;
private int[] prg_reg;
internal override void HardReset()
{
base.HardReset();
flag_c = (flag_p = false);
address_8001 = 0;
prg_reg = new int[4];
prg_reg[0] = 0;
prg_reg[1] = 1;
prg_reg[2] = PRG_ROM_08KB_Mask - 1;
prg_reg[3] = PRG_ROM_08KB_Mask;
SetupPRG();
chr_reg = new int[6];
for (int i = 0; i < 6; i++)
{
chr_reg[i] = 0;
}
}
internal override void WritePRG(ref ushort address, ref byte data)
{
switch (address & 0xE001)
{
case 32768:
address_8001 = data & 7;
flag_c = (data & 0x80) != 0;
flag_p = (data & 0x40) != 0;
SetupCHR();
SetupPRG();
break;
case 32769:
switch (address_8001)
{
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
chr_reg[address_8001] = data;
SetupCHR();
break;
case 6:
case 7:
prg_reg[address_8001 - 6] = data & PRG_ROM_08KB_Mask;
SetupPRG();
break;
}
break;
}
}
private void SetupCHR()
{
if (!flag_c)
{
Switch02KCHR(chr_reg[0] >> 1, CHRArea.Area0000);
Switch02KCHR(chr_reg[1] >> 1, CHRArea.Area0800);
Switch01KCHR(chr_reg[2], CHRArea.Area1000);
Switch01KCHR(chr_reg[3], CHRArea.Area1400);
Switch01KCHR(chr_reg[4], CHRArea.Area1800);
Switch01KCHR(chr_reg[5], CHRArea.Area1C00);
}
else
{
Switch02KCHR(chr_reg[0] >> 1, CHRArea.Area1000);
Switch02KCHR(chr_reg[1] >> 1, CHRArea.Area1800);
Switch01KCHR(chr_reg[2], CHRArea.Area0000);
Switch01KCHR(chr_reg[3], CHRArea.Area0400);
Switch01KCHR(chr_reg[4], CHRArea.Area0800);
Switch01KCHR(chr_reg[5], CHRArea.Area0C00);
}
}
private void SetupPRG()
{
Switch08KPRG(prg_reg[flag_p ? 2 : 0], PRGArea.Area8000);
Switch08KPRG(prg_reg[1], PRGArea.AreaA000);
Switch08KPRG(prg_reg[(!flag_p) ? 2 : 0], PRGArea.AreaC000);
Switch08KPRG(prg_reg[3], PRGArea.AreaE000);
}
internal override void WriteStateData(ref BinaryWriter stream)
{
base.WriteStateData(ref stream);
stream.Write(flag_c);
stream.Write(flag_p);
stream.Write(address_8001);
for (int i = 0; i < chr_reg.Length; i++)
{
stream.Write(chr_reg[i]);
}
for (int j = 0; j < prg_reg.Length; j++)
{
stream.Write(prg_reg[j]);
}
}
internal override void ReadStateData(ref BinaryReader stream)
{
base.ReadStateData(ref stream);
flag_c = stream.ReadBoolean();
flag_p = stream.ReadBoolean();
address_8001 = stream.ReadInt32();
for (int i = 0; i < chr_reg.Length; i++)
{
chr_reg[i] = stream.ReadInt32();
}
for (int j = 0; j < prg_reg.Length; j++)
{
prg_reg[j] = stream.ReadInt32();
}
}
}
}