AxibugEmuOnline/AxibugEmuOnline.Client/Assets/MyNes.Core/Mapper255.cs
2024-07-03 18:22:22 +08:00

67 lines
1.6 KiB
C#

using System.IO;
namespace MyNes.Core
{
[BoardInfo("Unknown", 255)]
[HassIssues]
internal class Mapper255 : Board
{
private byte[] RAM;
internal override string Issues => MNInterfaceLanguage.IssueMapper255;
internal override void HardReset()
{
base.HardReset();
RAM = new byte[4];
}
internal override void WriteEX(ref ushort address, ref byte data)
{
if (address >= 22528)
{
RAM[address & 3] = (byte)(data & 0xFu);
}
}
internal override void ReadEX(ref ushort address, out byte data)
{
if (address >= 22528)
{
data = RAM[address & 3];
}
else
{
data = 0;
}
}
internal override void WritePRG(ref ushort address, ref byte data)
{
Switch08KCHR(address & 0x3F);
if ((address & 0x1000) == 4096)
{
Switch16KPRG((address >> 6) & 0x3F, PRGArea.Area8000);
Switch16KPRG((address >> 6) & 0x3F, PRGArea.AreaC000);
}
else
{
Switch32KPRG(((address >> 6) & 0x3F) >> 1, PRGArea.Area8000);
}
Switch01KNMTFromMirroring(((address & 0x2000) == 8192) ? Mirroring.Horz : Mirroring.Vert);
}
internal override void WriteStateData(ref BinaryWriter stream)
{
base.WriteStateData(ref stream);
stream.Write(RAM);
}
internal override void ReadStateData(ref BinaryReader stream)
{
base.ReadStateData(ref stream);
stream.Read(RAM, 0, RAM.Length);
}
}
}