forked from sin365/AxibugEmuOnline
64 lines
1.6 KiB
C#
64 lines
1.6 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();
|
|
}
|
|
}
|
|
}
|