73 lines
1.3 KiB
C#
73 lines
1.3 KiB
C#
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 Mapper178 : Mapper
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{
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BYTE[] reg = new byte[3];
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BYTE banknum;
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public Mapper178(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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reg[0] = 0;
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reg[1] = 0;
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reg[2] = 0;
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banknum = 0;
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SetBank_CPU();
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}
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//void Mapper178::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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if (addr == 0x4800)
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{
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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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}
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else if (addr == 0x4801)
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{
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reg[0] = (byte)((data >> 1) & 0x0f);
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SetBank_CPU();
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}
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else if (addr == 0x4802)
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{
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reg[1] = (byte)((data << 2) & 0x0f);
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// SetBank_CPU();
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}
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else if (addr == 0x4803)
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{
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//unknown
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}
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else if (addr >= 0x6000)
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{
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CPU_MEM_BANK[addr >> 13][addr & 0x1FFF] = data;
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}
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}
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//void Write(WORD addr, BYTE data)
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public override void Write(ushort addr, byte data)
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{
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// SetPROM_32K_Bank( data );
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}
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void SetBank_CPU()
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{
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banknum = (byte)((reg[0] + reg[1]) & 0x0f);
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SetPROM_32K_Bank(banknum);
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}
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public override bool IsStateSave()
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{
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return true;
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}
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}
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}
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