95 lines
2.5 KiB
C#
95 lines
2.5 KiB
C#
//////////////////////////////////////////////////////////////////////////
|
|
// Mapper226 76-in-1 //
|
|
//////////////////////////////////////////////////////////////////////////
|
|
using static VirtualNes.MMU;
|
|
using BYTE = System.Byte;
|
|
|
|
|
|
namespace VirtualNes.Core
|
|
{
|
|
public class Mapper226 : Mapper
|
|
{
|
|
BYTE[] reg = new byte[2];
|
|
public Mapper226(NES parent) : base(parent)
|
|
{
|
|
}
|
|
|
|
public override void Reset()
|
|
{
|
|
SetPROM_32K_Bank(0);
|
|
|
|
reg[0] = 0;
|
|
reg[1] = 0;
|
|
}
|
|
|
|
//void Mapper226::Write(WORD addr, BYTE data)
|
|
public override void Write(ushort addr, byte data)
|
|
{
|
|
if ((addr & 0x001) != 0)
|
|
{
|
|
reg[1] = data;
|
|
}
|
|
else
|
|
{
|
|
reg[0] = data;
|
|
}
|
|
|
|
if ((reg[0] & 0x40) != 0)
|
|
{
|
|
SetVRAM_Mirror(VRAM_VMIRROR);
|
|
}
|
|
else
|
|
{
|
|
SetVRAM_Mirror(VRAM_HMIRROR);
|
|
}
|
|
|
|
BYTE bank = (byte)(((reg[0] & 0x1E) >> 1) | ((reg[0] & 0x80) >> 3) | ((reg[1] & 0x01) << 5));
|
|
|
|
if ((reg[0] & 0x20) != 0)
|
|
{
|
|
if ((reg[0] & 0x01) != 0)
|
|
{
|
|
SetPROM_8K_Bank(4, bank * 4 + 2);
|
|
SetPROM_8K_Bank(5, bank * 4 + 3);
|
|
SetPROM_8K_Bank(6, bank * 4 + 2);
|
|
SetPROM_8K_Bank(7, bank * 4 + 3);
|
|
}
|
|
else
|
|
{
|
|
SetPROM_8K_Bank(4, bank * 4 + 0);
|
|
SetPROM_8K_Bank(5, bank * 4 + 1);
|
|
SetPROM_8K_Bank(6, bank * 4 + 0);
|
|
SetPROM_8K_Bank(7, bank * 4 + 1);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
SetPROM_8K_Bank(4, bank * 4 + 0);
|
|
SetPROM_8K_Bank(5, bank * 4 + 1);
|
|
SetPROM_8K_Bank(6, bank * 4 + 2);
|
|
SetPROM_8K_Bank(7, bank * 4 + 3);
|
|
}
|
|
}
|
|
|
|
public override bool IsStateSave()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
//void Mapper226::SaveState(LPBYTE p)
|
|
public override void SaveState(byte[] p)
|
|
{
|
|
p[0] = reg[0];
|
|
p[1] = reg[1];
|
|
}
|
|
|
|
//void Mapper226::LoadState(LPBYTE p)
|
|
public override void LoadState(byte[] p)
|
|
{
|
|
reg[0] = p[0];
|
|
reg[1] = p[1];
|
|
}
|
|
|
|
}
|
|
}
|