87 lines
2.6 KiB
C#
87 lines
2.6 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper133 SACHEN CHEN //
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//////////////////////////////////////////////////////////////////////////
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using static VirtualNes.MMU;
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using static VirtualNes.Core.CPU;
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using INT = System.Int32;
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using BYTE = System.Byte;
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using System;
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using Codice.CM.Client.Differences;
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namespace VirtualNes.Core
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{
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public class Mapper134 : Mapper
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{
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BYTE cmd, prg, chr;
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public Mapper134(NES parent) : base(parent)
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{
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}
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public override void Reset()
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{
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SetPROM_32K_Bank(0);
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// SetPROM_16K_Bank( 6, 0 );
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// SetPROM_16K_Bank( 6, 1 );
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SetVROM_8K_Bank(0);
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}
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//void Mapper134::WriteLow(WORD addr, BYTE data)
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public override void WriteLow(ushort addr, byte data)
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{
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switch (addr & 0x4101)
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{
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case 0x4100:
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cmd = (byte)(data & 0x07);
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break;
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case 0x4101:
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switch (cmd)
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{
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case 0:
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prg = 0;
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chr = 3;
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break;
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case 4:
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chr &= 0x3;
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chr |= (byte)((data & 0x07) << 2);
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break;
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case 5:
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prg = (byte)(data & 0x07);
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break;
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case 6:
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chr &= 0x1C;
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chr |= (byte)(data & 0x3);
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break;
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case 7:
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if ((data & 0x01) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
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else SetVRAM_Mirror(VRAM_VMIRROR);
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break;
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}
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break;
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}
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SetPROM_32K_Bank(prg);
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// SetPROM_16K_Bank( 4, (prg<<1)|0 );
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// SetPROM_16K_Bank( 6, (prg<<1)|1 );
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SetVROM_8K_Bank(chr);
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CPU_MEM_BANK[addr >> 13][addr & 0x1FFF] = data;
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}
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//void Mapper134::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = cmd;
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p[1] = prg;
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p[2] = chr;
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}
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//void Mapper134::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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cmd = p[0];
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prg = p[1];
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chr = p[2];
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}
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}
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}
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