113 lines
2.6 KiB
C#
113 lines
2.6 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("Sunsoft 4", 68)]
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internal class Mapper068 : Board
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{
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private bool flag_r;
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private bool flag_m;
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private int nt_reg0;
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private int nt_reg1;
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private int temp;
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internal override void HardReset()
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{
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base.HardReset();
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Switch16KPRG(PRG_ROM_16KB_Mask, PRGArea.AreaC000);
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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 & 0xF000)
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{
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case 32768:
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Switch02KCHR(data, CHRArea.Area0000);
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break;
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case 36864:
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Switch02KCHR(data, CHRArea.Area0800);
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break;
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case 40960:
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Switch02KCHR(data, CHRArea.Area1000);
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break;
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case 45056:
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Switch02KCHR(data, CHRArea.Area1800);
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break;
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case 49152:
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nt_reg0 = (data & 0x7F) | 0x80;
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break;
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case 53248:
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nt_reg1 = (data & 0x7F) | 0x80;
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break;
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case 57344:
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flag_r = (data & 0x10) == 16;
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flag_m = (data & 1) == 1;
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Switch01KNMTFromMirroring(flag_m ? Mirroring.Horz : Mirroring.Vert);
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break;
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case 61440:
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Switch16KPRG(data, PRGArea.Area8000);
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break;
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}
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}
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internal override void ReadNMT(ref ushort address, out byte data)
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{
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if (!flag_r)
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{
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data = NMT_RAM[NMT_AREA_BLK_INDEX[(address >> 10) & 3]][address & 0x3FF];
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return;
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}
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switch ((address >> 10) & 3)
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{
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case 0:
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data = CHR_ROM[nt_reg0][address & 0x3FF];
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break;
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case 1:
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data = CHR_ROM[flag_m ? nt_reg0 : nt_reg1][address & 0x3FF];
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break;
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case 2:
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data = CHR_ROM[flag_m ? nt_reg1 : nt_reg0][address & 0x3FF];
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break;
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case 3:
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data = CHR_ROM[nt_reg1][address & 0x3FF];
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break;
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default:
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data = 0;
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break;
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}
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}
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internal override void WriteNMT(ref ushort address, ref byte data)
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{
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if (!flag_r)
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{
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base.WriteNMT(ref address, ref data);
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}
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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_r);
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stream.Write(flag_m);
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stream.Write(nt_reg0);
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stream.Write(nt_reg1);
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stream.Write(temp);
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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_r = stream.ReadBoolean();
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flag_m = stream.ReadBoolean();
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nt_reg0 = stream.ReadInt32();
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nt_reg1 = stream.ReadInt32();
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temp = stream.ReadInt32();
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}
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}
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}
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