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