AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper236.cs

99 lines
3.0 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper236 800-in-1 //
//////////////////////////////////////////////////////////////////////////
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 Mapper236 : Mapper
{
BYTE bank, mode;
public Mapper236(NES parent) : base(parent)
{
}
public override void Reset()
{
SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
bank = mode = 0;
}
//void Mapper236::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
if (addr >= 0x8000 && addr <= 0xBFFF)
{
bank = (byte)(((addr & 0x03) << 4) | (bank & 0x07));
}
else
{
bank = (byte)((addr & 0x07) | (bank & 0x30));
mode = (byte)(addr & 0x30);
}
if ((addr & 0x20) != 0)
{
SetVRAM_Mirror(VRAM_HMIRROR);
}
else
{
SetVRAM_Mirror(VRAM_VMIRROR);
}
switch (mode)
{
case 0x00:
bank |= 0x08;
SetPROM_8K_Bank(4, bank * 2 + 0);
SetPROM_8K_Bank(5, bank * 2 + 1);
SetPROM_8K_Bank(6, (bank | 0x07) * 2 + 0);
SetPROM_8K_Bank(7, (bank | 0x07) * 2 + 1);
break;
case 0x10:
bank |= 0x37;
SetPROM_8K_Bank(4, bank * 2 + 0);
SetPROM_8K_Bank(5, bank * 2 + 1);
SetPROM_8K_Bank(6, (bank | 0x07) * 2 + 0);
SetPROM_8K_Bank(7, (bank | 0x07) * 2 + 1);
break;
case 0x20:
bank |= 0x08;
SetPROM_8K_Bank(4, (bank & 0xFE) * 2 + 0);
SetPROM_8K_Bank(5, (bank & 0xFE) * 2 + 1);
SetPROM_8K_Bank(6, (bank & 0xFE) * 2 + 2);
SetPROM_8K_Bank(7, (bank & 0xFE) * 2 + 3);
break;
case 0x30:
bank |= 0x08;
SetPROM_8K_Bank(4, bank * 2 + 0);
SetPROM_8K_Bank(5, bank * 2 + 1);
SetPROM_8K_Bank(6, bank * 2 + 0);
SetPROM_8K_Bank(7, bank * 2 + 1);
break;
}
}
//void Mapper236::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
p[0] = bank;
p[1] = mode;
}
//void Mapper236::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
bank = p[0];
mode = p[1];
}
}
}