AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper234.cs

108 lines
2.7 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper234 Maxi-15 //
//////////////////////////////////////////////////////////////////////////
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 Mapper234 : Mapper
{
BYTE[] reg = new byte[2];
public Mapper234(NES parent) : base(parent)
{
}
public override void Reset()
{
SetPROM_32K_Bank(0, 1, 2, 3);
reg[0] = 0;
reg[1] = 0;
}
//void Mapper234::Read(WORD addr, BYTE data)
public override void Read(ushort addr, byte data)
{
if (addr >= 0xFF80 && addr <= 0xFF9F)
{
if (reg[0] != 0)
{
reg[0] = data;
SetBank();
}
}
if (addr >= 0xFFE8 && addr <= 0xFFF7)
{
reg[1] = data;
SetBank();
}
}
//void Mapper234::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
if (addr >= 0xFF80 && addr <= 0xFF9F)
{
if (reg[0] == 0)
{
reg[0] = data;
SetBank();
}
}
if (addr >= 0xFFE8 && addr <= 0xFFF7)
{
reg[1] = data;
SetBank();
}
}
void SetBank()
{
if ((reg[0] & 0x80) != 0)
{
SetVRAM_Mirror(VRAM_HMIRROR);
}
else
{
SetVRAM_Mirror(VRAM_VMIRROR);
}
if ((reg[0] & 0x40) != 0)
{
SetPROM_32K_Bank((reg[0] & 0x0E) | (reg[1] & 0x01));
SetVROM_8K_Bank(((reg[0] & 0x0E) << 2) | ((reg[1] >> 4) & 0x07));
}
else
{
SetPROM_32K_Bank(reg[0] & 0x0F);
SetVROM_8K_Bank(((reg[0] & 0x0F) << 2) | ((reg[1] >> 4) & 0x03));
}
}
public override bool IsStateSave()
{
return true;
}
//void Mapper234::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
p[0] = reg[0];
p[1] = reg[1];
}
//void Mapper234::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
reg[0] = p[0];
reg[1] = p[1];
}
}
}