165 lines
3.3 KiB
C#
165 lines
3.3 KiB
C#
//////////////////////////////////////////////////////////////////////////
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// Mapper068 SunSoft Mapper 4 (After Burner II) //
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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 Mapper068 : Mapper
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{
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BYTE[] reg = new byte[4];
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BYTE coin;
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public Mapper068(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] = reg[1] = reg[2] = reg[3] = 0;
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coin = 0;
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SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
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}
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#if FALSE //0
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BYTE Mapper068::ExRead( WORD addr )
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{
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if( addr == 0x4020 ) {
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DEBUGOUT( "RD $4020:%02X\n", coin );
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return coin;
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}
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return addr>>8;
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}
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void Mapper068::ExWrite( WORD addr, BYTE data )
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{
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if( addr == 0x4020 ) {
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DEBUGOUT( "WR $4020:%02X\n", data );
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coin = data;
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}
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}
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#endif
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//void Mapper068::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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switch (addr & 0xF000)
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{
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case 0x8000:
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SetVROM_2K_Bank(0, data);
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break;
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case 0x9000:
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SetVROM_2K_Bank(2, data);
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break;
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case 0xA000:
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SetVROM_2K_Bank(4, data);
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break;
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case 0xB000:
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SetVROM_2K_Bank(6, data);
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break;
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case 0xC000:
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reg[2] = data;
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SetBank();
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break;
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case 0xD000:
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reg[3] = data;
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SetBank();
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break;
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case 0xE000:
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reg[0] = (byte)((data & 0x10) >> 4);
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reg[1] = (byte)(data & 0x03);
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SetBank();
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break;
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case 0xF000:
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SetPROM_16K_Bank(4, data);
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break;
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}
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}
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void SetBank()
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{
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if (reg[0] != 0)
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{
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switch (reg[1])
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{
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case 0:
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SetVROM_1K_Bank(8, (INT)reg[2] + 0x80);
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SetVROM_1K_Bank(9, (INT)reg[3] + 0x80);
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SetVROM_1K_Bank(10, (INT)reg[2] + 0x80);
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SetVROM_1K_Bank(11, (INT)reg[3] + 0x80);
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break;
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case 1:
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SetVROM_1K_Bank(8, (INT)reg[2] + 0x80);
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SetVROM_1K_Bank(9, (INT)reg[2] + 0x80);
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SetVROM_1K_Bank(10, (INT)reg[3] + 0x80);
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SetVROM_1K_Bank(11, (INT)reg[3] + 0x80);
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break;
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case 2:
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SetVROM_1K_Bank(8, (INT)reg[2] + 0x80);
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SetVROM_1K_Bank(9, (INT)reg[2] + 0x80);
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SetVROM_1K_Bank(10, (INT)reg[2] + 0x80);
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SetVROM_1K_Bank(11, (INT)reg[2] + 0x80);
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break;
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case 3:
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SetVROM_1K_Bank(8, (INT)reg[3] + 0x80);
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SetVROM_1K_Bank(9, (INT)reg[3] + 0x80);
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SetVROM_1K_Bank(10, (INT)reg[3] + 0x80);
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SetVROM_1K_Bank(11, (INT)reg[3] + 0x80);
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break;
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}
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}
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else
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{
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switch (reg[1])
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{
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case 0:
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SetVRAM_Mirror(VRAM_VMIRROR);
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break;
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case 1:
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SetVRAM_Mirror(VRAM_HMIRROR);
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break;
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case 2:
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SetVRAM_Mirror(VRAM_MIRROR4L);
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break;
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case 3:
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SetVRAM_Mirror(VRAM_MIRROR4H);
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break;
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}
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}
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}
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//void Mapper068::SaveState(LPBYTE p)
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public override void SaveState(byte[] p)
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{
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p[0] = reg[0];
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p[1] = reg[1];
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p[2] = reg[2];
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p[3] = reg[3];
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}
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//void Mapper068::LoadState(LPBYTE p)
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public override void LoadState(byte[] p)
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{
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reg[0] = p[0];
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reg[1] = p[1];
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reg[2] = p[2];
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reg[3] = p[3];
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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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