AxibugEmuOnline/Core/VirtualNes.Core/Mapper/Mapper228.cs

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//////////////////////////////////////////////////////////////////////////
// Mapper228 Action 52 //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using BYTE = System.Byte;
namespace VirtualNes.Core
{
public class Mapper228 : Mapper
{
public Mapper228(NES parent) : base(parent)
{
}
public override void Reset()
{
SetPROM_32K_Bank(0);
SetVROM_8K_Bank(0);
}
//void Mapper228::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
BYTE prg = (byte)((addr & 0x0780) >> 7);
switch ((addr & 0x1800) >> 11)
{
case 1:
prg |= 0x10;
break;
case 3:
prg |= 0x20;
break;
}
if ((addr & 0x0020) != 0)
{
prg <<= 1;
if ((addr & 0x0040) != 0)
{
prg++;
}
SetPROM_8K_Bank(4, prg * 4 + 0);
SetPROM_8K_Bank(5, prg * 4 + 1);
SetPROM_8K_Bank(6, prg * 4 + 0);
SetPROM_8K_Bank(7, prg * 4 + 1);
}
else
{
SetPROM_8K_Bank(4, prg * 4 + 0);
SetPROM_8K_Bank(5, prg * 4 + 1);
SetPROM_8K_Bank(6, prg * 4 + 2);
SetPROM_8K_Bank(7, prg * 4 + 3);
}
SetVROM_8K_Bank(((addr & 0x000F) << 2) | (data & 0x03));
if ((addr & 0x2000) != 0)
{
SetVRAM_Mirror(VRAM_HMIRROR);
}
else
{
SetVRAM_Mirror(VRAM_VMIRROR);
}
}
}
}