forked from sin365/AxibugEmuOnline
132 lines
3.1 KiB
C#
132 lines
3.1 KiB
C#
using System.IO;
|
|
|
|
namespace MyNes.Core
|
|
{
|
|
[BoardInfo("Unknown", 206)]
|
|
internal class Mapper206 : Board
|
|
{
|
|
private bool flag_c;
|
|
|
|
private bool flag_p;
|
|
|
|
private int address_8001;
|
|
|
|
private int[] chr_reg;
|
|
|
|
private int[] prg_reg;
|
|
|
|
internal override void HardReset()
|
|
{
|
|
base.HardReset();
|
|
flag_c = (flag_p = false);
|
|
address_8001 = 0;
|
|
prg_reg = new int[4];
|
|
prg_reg[0] = 0;
|
|
prg_reg[1] = 1;
|
|
prg_reg[2] = PRG_ROM_08KB_Mask - 1;
|
|
prg_reg[3] = PRG_ROM_08KB_Mask;
|
|
SetupPRG();
|
|
chr_reg = new int[6];
|
|
for (int i = 0; i < 6; i++)
|
|
{
|
|
chr_reg[i] = 0;
|
|
}
|
|
}
|
|
|
|
internal override void WritePRG(ref ushort address, ref byte data)
|
|
{
|
|
switch (address & 0xE001)
|
|
{
|
|
case 32768:
|
|
address_8001 = data & 7;
|
|
flag_c = (data & 0x80) != 0;
|
|
flag_p = (data & 0x40) != 0;
|
|
SetupCHR();
|
|
SetupPRG();
|
|
break;
|
|
case 32769:
|
|
switch (address_8001)
|
|
{
|
|
case 0:
|
|
case 1:
|
|
case 2:
|
|
case 3:
|
|
case 4:
|
|
case 5:
|
|
chr_reg[address_8001] = data;
|
|
SetupCHR();
|
|
break;
|
|
case 6:
|
|
case 7:
|
|
prg_reg[address_8001 - 6] = data & PRG_ROM_08KB_Mask;
|
|
SetupPRG();
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
private void SetupCHR()
|
|
{
|
|
if (!flag_c)
|
|
{
|
|
Switch02KCHR(chr_reg[0] >> 1, CHRArea.Area0000);
|
|
Switch02KCHR(chr_reg[1] >> 1, CHRArea.Area0800);
|
|
Switch01KCHR(chr_reg[2], CHRArea.Area1000);
|
|
Switch01KCHR(chr_reg[3], CHRArea.Area1400);
|
|
Switch01KCHR(chr_reg[4], CHRArea.Area1800);
|
|
Switch01KCHR(chr_reg[5], CHRArea.Area1C00);
|
|
}
|
|
else
|
|
{
|
|
Switch02KCHR(chr_reg[0] >> 1, CHRArea.Area1000);
|
|
Switch02KCHR(chr_reg[1] >> 1, CHRArea.Area1800);
|
|
Switch01KCHR(chr_reg[2], CHRArea.Area0000);
|
|
Switch01KCHR(chr_reg[3], CHRArea.Area0400);
|
|
Switch01KCHR(chr_reg[4], CHRArea.Area0800);
|
|
Switch01KCHR(chr_reg[5], CHRArea.Area0C00);
|
|
}
|
|
}
|
|
|
|
private void SetupPRG()
|
|
{
|
|
Switch08KPRG(prg_reg[flag_p ? 2 : 0], PRGArea.Area8000);
|
|
Switch08KPRG(prg_reg[1], PRGArea.AreaA000);
|
|
Switch08KPRG(prg_reg[(!flag_p) ? 2 : 0], PRGArea.AreaC000);
|
|
Switch08KPRG(prg_reg[3], PRGArea.AreaE000);
|
|
}
|
|
|
|
internal override void WriteStateData(ref BinaryWriter stream)
|
|
{
|
|
base.WriteStateData(ref stream);
|
|
stream.Write(flag_c);
|
|
stream.Write(flag_p);
|
|
stream.Write(address_8001);
|
|
for (int i = 0; i < chr_reg.Length; i++)
|
|
{
|
|
stream.Write(chr_reg[i]);
|
|
}
|
|
for (int j = 0; j < prg_reg.Length; j++)
|
|
{
|
|
stream.Write(prg_reg[j]);
|
|
}
|
|
}
|
|
|
|
internal override void ReadStateData(ref BinaryReader stream)
|
|
{
|
|
base.ReadStateData(ref stream);
|
|
flag_c = stream.ReadBoolean();
|
|
flag_p = stream.ReadBoolean();
|
|
address_8001 = stream.ReadInt32();
|
|
for (int i = 0; i < chr_reg.Length; i++)
|
|
{
|
|
chr_reg[i] = stream.ReadInt32();
|
|
}
|
|
for (int j = 0; j < prg_reg.Length; j++)
|
|
{
|
|
prg_reg[j] = stream.ReadInt32();
|
|
}
|
|
}
|
|
}
|
|
}
|