AxibugEmuOnline/Core/VirtualNes.Core/Mapper/Mapper057.cs

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//////////////////////////////////////////////////////////////////////////
// Mapper057 //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using BYTE = System.Byte;
namespace VirtualNes.Core
{
public class Mapper057 : Mapper
{
BYTE reg;
public Mapper057(NES parent) : base(parent)
{
}
public override void Reset()
{
SetPROM_32K_Bank(0, 1, 0, 1);
SetVROM_8K_Bank(0);
reg = 0;
}
//void Mapper057::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
switch (addr)
{
case 0x8000:
case 0x8001:
case 0x8002:
case 0x8003:
if ((data & 0x40) != 0)
{
SetVROM_8K_Bank((data & 0x03) + ((reg & 0x10) >> 1) + (reg & 0x07));
}
break;
case 0x8800:
reg = data;
if ((data & 0x80) != 0)
{
SetPROM_8K_Bank(4, ((data & 0x40) >> 6) * 4 + 8 + 0);
SetPROM_8K_Bank(5, ((data & 0x40) >> 6) * 4 + 8 + 1);
SetPROM_8K_Bank(6, ((data & 0x40) >> 6) * 4 + 8 + 2);
SetPROM_8K_Bank(7, ((data & 0x40) >> 6) * 4 + 8 + 3);
}
else
{
SetPROM_8K_Bank(4, ((data & 0x60) >> 5) * 2 + 0);
SetPROM_8K_Bank(5, ((data & 0x60) >> 5) * 2 + 1);
SetPROM_8K_Bank(6, ((data & 0x60) >> 5) * 2 + 0);
SetPROM_8K_Bank(7, ((data & 0x60) >> 5) * 2 + 1);
}
SetVROM_8K_Bank((data & 0x07) + ((data & 0x10) >> 1));
if ((data & 0x08) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
else SetVRAM_Mirror(VRAM_VMIRROR);
break;
}
}
//void Mapper057::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
p[0] = reg;
}
//void Mapper057::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
reg = p[0];
}
public override bool IsStateSave()
{
return true;
}
}
}