AxibugEmuOnline/OtherCore/MyNes.Standard2/MyNes.Core/Mapper051.cs

80 lines
1.7 KiB
C#
Raw Normal View History

2024-07-24 15:03:33 +08:00
using System.IO;
namespace MyNes.Core
{
[BoardInfo("11-in-1", 51)]
internal class Mapper051 : Board
{
private int bank;
private int mode = 1;
private int offset;
internal override void HardReset()
{
base.HardReset();
bank = 0;
mode = 1;
offset = 0;
}
internal override void WritePRG(ref ushort address, ref byte data)
{
switch (address & 0xE000)
{
case 32768:
case 57344:
bank = data & 0xF;
UpdateBanks();
break;
case 49152:
bank = data & 0xF;
mode = ((data >> 3) & 2) | (mode & 1);
UpdateBanks();
break;
}
}
internal override void WriteSRM(ref ushort address, ref byte data)
{
mode = ((data >> 3) & 2) | ((data >> 1) & 1);
UpdateBanks();
}
private void UpdateBanks()
{
offset = 0;
if ((mode & 1) == 1)
{
Switch32KPRG(bank, PRGArea.Area8000);
offset = 35;
}
else
{
Switch08KPRG((bank << 1) | (mode >> 1), PRGArea.Area8000);
Switch08KPRG((bank << 1) | 7, PRGArea.Area8000);
offset = 47;
}
Switch08KPRG(offset | (bank << 2), PRGArea.Area6000);
Switch01KNMTFromMirroring((mode == 3) ? Mirroring.Horz : Mirroring.Vert);
}
internal override void WriteStateData(ref BinaryWriter stream)
{
base.WriteStateData(ref stream);
stream.Write(bank);
stream.Write(mode);
stream.Write(offset);
}
internal override void ReadStateData(ref BinaryReader stream)
{
base.ReadStateData(ref stream);
bank = stream.ReadInt32();
mode = stream.ReadInt32();
offset = stream.ReadInt32();
}
}
}