85 lines
2.5 KiB
C#
85 lines
2.5 KiB
C#
//////////////////////////////////////////////////////////////////////////
|
|
// 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;
|
|
}
|
|
}
|
|
}
|