AxibugEmuOnline/AxibugEmuOnline.Client/Assets/MyNes.Core/Mapper226.cs
2024-07-03 18:22:22 +08:00

67 lines
1.6 KiB
C#

using System.IO;
namespace MyNes.Core
{
[BoardInfo("Unknown", 226)]
internal class Mapper226 : Board
{
private int prg_reg;
private bool prg_mode;
internal override void HardReset()
{
base.HardReset();
prg_reg = 0;
prg_mode = false;
}
internal override void WritePRG(ref ushort address, ref byte data)
{
switch (address & 0x8001)
{
case 32768:
prg_reg = (data & 0x1F) | ((data & 0x80) >> 2) | (prg_reg & 0xC0);
prg_mode = (data & 0x20) == 32;
Switch01KNMTFromMirroring(((data & 0x40) == 64) ? Mirroring.Vert : Mirroring.Horz);
if (prg_mode)
{
Switch16KPRG(prg_reg, PRGArea.Area8000);
Switch16KPRG(prg_reg, PRGArea.AreaC000);
}
else
{
Switch32KPRG(prg_reg >> 1, PRGArea.Area8000);
}
break;
case 32769:
prg_reg = ((data & 1) << 6) | (prg_reg & 0x3F);
if (prg_mode)
{
Switch16KPRG(prg_reg, PRGArea.Area8000);
Switch16KPRG(prg_reg, PRGArea.AreaC000);
}
else
{
Switch32KPRG(prg_reg >> 1, PRGArea.Area8000);
}
break;
}
}
internal override void WriteStateData(ref BinaryWriter stream)
{
base.WriteStateData(ref stream);
stream.Write(prg_reg);
stream.Write(prg_mode);
}
internal override void ReadStateData(ref BinaryReader stream)
{
base.ReadStateData(ref stream);
prg_reg = stream.ReadInt32();
prg_mode = stream.ReadBoolean();
}
}
}