AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper251.cs

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2024-08-03 22:26:53 +08:00
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 Mapper251 : Mapper
{
BYTE[] reg = new BYTE[11];
BYTE[] breg = new BYTE[4];
public Mapper251(NES parent) : base(parent)
{
}
public override void Reset()
{
SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
SetVRAM_Mirror(VRAM_VMIRROR);
INT i;
for (i = 0; i < 11; i++)
reg[i] = 0;
for (i = 0; i < 4; i++)
breg[i] = 0;
}
//void Mapper251::WriteLow(WORD addr, BYTE data)
public override void WriteLow(ushort addr, byte data)
{
if ((addr & 0xE001) == 0x6000)
{
if (reg[9] != null)
{
breg[reg[10]++] = data;
if (reg[10] == 4)
{
reg[10] = 0;
SetBank();
}
}
}
}
//void Mapper251::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
switch (addr & 0xE001)
{
case 0x8000:
reg[8] = data;
SetBank();
break;
case 0x8001:
reg[reg[8] & 0x07] = data;
SetBank();
break;
case 0xA001:
if ((data & 0x80)!= 0)
{
reg[9] = 1;
reg[10] = 0;
}
else
{
reg[9] = 0;
}
break;
}
}
//void Mapper251::SetBank()
public void SetBank()
{
INT[] chr = new INT[6];
INT[] prg = new int[4];
for (INT i = 0; i < 6; i++)
{
chr[i] = (reg[i] | (breg[1] << 4)) & ((breg[2] << 4) | 0x0F);
}
if ((reg[8] & 0x80) != 0)
{
SetVROM_8K_Bank(chr[2], chr[3], chr[4], chr[5], chr[0], chr[0] + 1, chr[1], chr[1] + 1);
}
else
{
SetVROM_8K_Bank(chr[0], chr[0] + 1, chr[1], chr[1] + 1, chr[2], chr[3], chr[4], chr[5]);
}
prg[0] = (reg[6] & ((breg[3] & 0x3F) ^ 0x3F)) | (breg[1]);
prg[1] = (reg[7] & ((breg[3] & 0x3F) ^ 0x3F)) | (breg[1]);
prg[2] = prg[3] = ((breg[3] & 0x3F) ^ 0x3F) | (breg[1]);
prg[2] &= PROM_8K_SIZE - 1;
if ((reg[8] & 0x40) != 0)
{
SetPROM_32K_Bank(prg[2], prg[1], prg[0], prg[3]);
}
else
{
SetPROM_32K_Bank(prg[0], prg[1], prg[2], prg[3]);
}
}
public override bool IsStateSave()
{
return true;
}
//void Mapper251::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
//INT i;
//for (i = 0; i < 11; i++)
//{
// p[i] = reg[i];
//}
//for (i = 0; i < 4; i++)
//{
// p[i + 11] = breg[i];
//}
}
//void Mapper251::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
//INT i;
//for (i = 0; i < 11; i++)
//{
// reg[i] = p[i];
//}
//for (i = 0; i < 4; i++)
//{
// reg[i] = p[i + 11];
//}
}
}
}