AxibugEmuOnline/AxibugEmuOnline.Client/Assets/MyNes.Core/Mapper075.cs
2024-07-03 18:22:22 +08:00

64 lines
1.7 KiB
C#

using System.IO;
namespace MyNes.Core
{
[BoardInfo("VRC1", 75)]
internal class Mapper075 : Board
{
private int chr0_reg;
private int chr1_reg;
internal override void HardReset()
{
base.HardReset();
Switch08KPRG(PRG_ROM_08KB_Mask, PRGArea.AreaE000);
}
internal override void WritePRG(ref ushort address, ref byte data)
{
switch (address & 0xF000)
{
case 32768:
Switch08KPRG(data & 0xF, PRGArea.Area8000);
break;
case 40960:
Switch08KPRG(data & 0xF, PRGArea.AreaA000);
break;
case 49152:
Switch08KPRG(data & 0xF, PRGArea.AreaC000);
break;
case 36864:
Switch01KNMTFromMirroring(((data & 1) == 1) ? Mirroring.Horz : Mirroring.Vert);
chr0_reg = (chr0_reg & 0xF) | ((data & 2) << 3);
Switch04KCHR(chr0_reg, CHRArea.Area0000);
chr1_reg = (chr1_reg & 0xF) | ((data & 4) << 2);
Switch04KCHR(chr1_reg, CHRArea.Area1000);
break;
case 57344:
chr0_reg = (chr0_reg & 0x10) | (data & 0xF);
Switch04KCHR(chr0_reg, CHRArea.Area0000);
break;
case 61440:
chr1_reg = (chr1_reg & 0x10) | (data & 0xF);
Switch04KCHR(chr1_reg, CHRArea.Area1000);
break;
}
}
internal override void WriteStateData(ref BinaryWriter stream)
{
base.WriteStateData(ref stream);
stream.Write(chr0_reg);
stream.Write(chr1_reg);
}
internal override void ReadStateData(ref BinaryReader stream)
{
base.ReadStateData(ref stream);
chr0_reg = stream.ReadInt32();
chr1_reg = stream.ReadInt32();
}
}
}