63 lines
1.4 KiB
C#
63 lines
1.4 KiB
C#
using System.IO;
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namespace MyNes.Core;
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[BoardInfo("VRC1", 75)]
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internal class Mapper075 : Board
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{
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private int chr0_reg;
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private int chr1_reg;
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internal override void HardReset()
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{
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base.HardReset();
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Switch08KPRG(PRG_ROM_08KB_Mask, PRGArea.AreaE000);
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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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Switch08KPRG(data & 0xF, PRGArea.Area8000);
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break;
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case 40960:
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Switch08KPRG(data & 0xF, PRGArea.AreaA000);
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break;
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case 49152:
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Switch08KPRG(data & 0xF, PRGArea.AreaC000);
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break;
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case 36864:
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Switch01KNMTFromMirroring(((data & 1) == 1) ? Mirroring.Horz : Mirroring.Vert);
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chr0_reg = (chr0_reg & 0xF) | ((data & 2) << 3);
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Switch04KCHR(chr0_reg, CHRArea.Area0000);
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chr1_reg = (chr1_reg & 0xF) | ((data & 4) << 2);
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Switch04KCHR(chr1_reg, CHRArea.Area1000);
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break;
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case 57344:
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chr0_reg = (chr0_reg & 0x10) | (data & 0xF);
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Switch04KCHR(chr0_reg, CHRArea.Area0000);
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break;
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case 61440:
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chr1_reg = (chr1_reg & 0x10) | (data & 0xF);
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Switch04KCHR(chr1_reg, CHRArea.Area1000);
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break;
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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(chr0_reg);
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stream.Write(chr1_reg);
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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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chr0_reg = stream.ReadInt32();
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chr1_reg = stream.ReadInt32();
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}
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}
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