AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper068.cs
2024-08-05 00:44:30 +08:00

165 lines
3.3 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper068 SunSoft Mapper 4 (After Burner II) //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using static VirtualNes.Core.CPU;
using INT = System.Int32;
using BYTE = System.Byte;
using System;
using Codice.CM.Client.Differences;
namespace VirtualNes.Core
{
public class Mapper068 : Mapper
{
BYTE[] reg = new byte[4];
BYTE coin;
public Mapper068(NES parent) : base(parent)
{
}
public override void Reset()
{
reg[0] = reg[1] = reg[2] = reg[3] = 0;
coin = 0;
SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
}
#if FALSE //0
BYTE Mapper068::ExRead( WORD addr )
{
if( addr == 0x4020 ) {
DEBUGOUT( "RD $4020:%02X\n", coin );
return coin;
}
return addr>>8;
}
void Mapper068::ExWrite( WORD addr, BYTE data )
{
if( addr == 0x4020 ) {
DEBUGOUT( "WR $4020:%02X\n", data );
coin = data;
}
}
#endif
//void Mapper068::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
switch (addr & 0xF000)
{
case 0x8000:
SetVROM_2K_Bank(0, data);
break;
case 0x9000:
SetVROM_2K_Bank(2, data);
break;
case 0xA000:
SetVROM_2K_Bank(4, data);
break;
case 0xB000:
SetVROM_2K_Bank(6, data);
break;
case 0xC000:
reg[2] = data;
SetBank();
break;
case 0xD000:
reg[3] = data;
SetBank();
break;
case 0xE000:
reg[0] = (byte)((data & 0x10) >> 4);
reg[1] = (byte)(data & 0x03);
SetBank();
break;
case 0xF000:
SetPROM_16K_Bank(4, data);
break;
}
}
void SetBank()
{
if (reg[0] != 0)
{
switch (reg[1])
{
case 0:
SetVROM_1K_Bank(8, (INT)reg[2] + 0x80);
SetVROM_1K_Bank(9, (INT)reg[3] + 0x80);
SetVROM_1K_Bank(10, (INT)reg[2] + 0x80);
SetVROM_1K_Bank(11, (INT)reg[3] + 0x80);
break;
case 1:
SetVROM_1K_Bank(8, (INT)reg[2] + 0x80);
SetVROM_1K_Bank(9, (INT)reg[2] + 0x80);
SetVROM_1K_Bank(10, (INT)reg[3] + 0x80);
SetVROM_1K_Bank(11, (INT)reg[3] + 0x80);
break;
case 2:
SetVROM_1K_Bank(8, (INT)reg[2] + 0x80);
SetVROM_1K_Bank(9, (INT)reg[2] + 0x80);
SetVROM_1K_Bank(10, (INT)reg[2] + 0x80);
SetVROM_1K_Bank(11, (INT)reg[2] + 0x80);
break;
case 3:
SetVROM_1K_Bank(8, (INT)reg[3] + 0x80);
SetVROM_1K_Bank(9, (INT)reg[3] + 0x80);
SetVROM_1K_Bank(10, (INT)reg[3] + 0x80);
SetVROM_1K_Bank(11, (INT)reg[3] + 0x80);
break;
}
}
else
{
switch (reg[1])
{
case 0:
SetVRAM_Mirror(VRAM_VMIRROR);
break;
case 1:
SetVRAM_Mirror(VRAM_HMIRROR);
break;
case 2:
SetVRAM_Mirror(VRAM_MIRROR4L);
break;
case 3:
SetVRAM_Mirror(VRAM_MIRROR4H);
break;
}
}
}
//void Mapper068::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
p[0] = reg[0];
p[1] = reg[1];
p[2] = reg[2];
p[3] = reg[3];
}
//void Mapper068::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
reg[0] = p[0];
reg[1] = p[1];
reg[2] = p[2];
reg[3] = p[3];
}
public override bool IsStateSave()
{
return true;
}
}
}