AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper198.cs
2024-08-03 23:15:19 +08:00

208 lines
5.9 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper198 Nintendo MMC3 //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using static VirtualNes.Core.CPU;
using INT = System.Int32;
using BYTE = System.Byte;
using System;
namespace VirtualNes.Core
{
public class Mapper198 : Mapper
{
BYTE[] reg = new byte[8];
BYTE prg0, prg1;
BYTE chr01, chr23, chr4, chr5, chr6, chr7;
BYTE[] adr5000buf = new BYTE[1024 * 4];
public Mapper198(NES parent) : base(parent)
{
}
public override void Reset()
{
for (INT i = 0; i < 8; i++)
{
reg[i] = 0x00;
}
prg0 = 0;
prg1 = 1;
SetBank_CPU();
chr01 = 0;
chr23 = 2;
chr4 = 4;
chr5 = 5;
chr6 = 6;
chr7 = 7;
SetBank_PPU();
}
//void Mapper198::WriteLow(WORD addr, BYTE data)
public override void WriteLow(ushort addr, byte data)
{
if (addr > 0x4018 && addr < 0x6000)
CPU_MEM_BANK[addr >> 13][addr & 0x1FFF] = data;
else
adr5000buf[addr & 0xFFF] = data;
}
//BYTE Mapper198::ReadLow(WORD addr)
public override byte ReadLow(ushort addr)
{
if (addr > 0x4018 && addr < 0x6000)
return CPU_MEM_BANK[addr >> 13][addr & 0x1FFF];
else
return adr5000buf[addr & 0xFFF];
}
//void Mapper198::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
switch (addr & 0xE001)
{
case 0x8000:
reg[0] = data;
SetBank_CPU();
SetBank_PPU();
break;
case 0x8001:
reg[1] = data;
switch (reg[0] & 0x07)
{
case 0x00:
chr01 = (byte)(data & 0xFE);
SetBank_PPU();
break;
case 0x01:
chr23 = (byte)(data & 0xFE);
SetBank_PPU();
break;
case 0x02:
chr4 = data;
SetBank_PPU();
break;
case 0x03:
chr5 = data;
SetBank_PPU();
break;
case 0x04:
chr6 = data;
SetBank_PPU();
break;
case 0x05:
chr7 = data;
SetBank_PPU();
break;
case 0x06:
if (data >= 0x50) data &= 0x4F;
prg0 = data;
SetBank_CPU();
break;
case 0x07:
prg1 = data;
SetBank_CPU();
break;
}
break;
case 0xA000:
reg[2] = data;
if (!nes.rom.Is4SCREEN())
{
if ((data & 0x01) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
else SetVRAM_Mirror(VRAM_VMIRROR);
}
break;
case 0xA001:
reg[3] = data;
break;
case 0xC000:
reg[4] = data;
break;
case 0xC001:
reg[5] = data;
break;
case 0xE000:
reg[6] = data;
break;
case 0xE001:
reg[7] = data;
break;
}
}
void SetBank_CPU()
{
if ((reg[0] & 0x40) != 0)
{
SetPROM_32K_Bank(PROM_8K_SIZE - 2, prg1, prg0, PROM_8K_SIZE - 1);
}
else
{
SetPROM_32K_Bank(prg0, prg1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
}
}
void SetBank_PPU()
{
if (VROM_1K_SIZE != 0)
{
if ((reg[0] & 0x80) != 0)
{
SetVROM_8K_Bank(chr4, chr5, chr6, chr7,
chr01, chr01 + 1, chr23, chr23 + 1);
}
else
{
SetVROM_8K_Bank(chr01, chr01 + 1, chr23, chr23 + 1,
chr4, chr5, chr6, chr7);
}
}
}
//void Mapper198::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
for (INT i = 0; i < 8; i++)
{
p[i] = reg[i];
}
p[8] = prg0;
p[9] = prg1;
p[10] = chr01;
p[11] = chr23;
p[12] = chr4;
p[13] = chr5;
p[14] = chr6;
p[15] = chr7;
}
//void Mapper198::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
for (INT i = 0; i < 8; i++)
{
reg[i] = p[i];
}
prg0 = p[8];
prg1 = p[9];
chr01 = p[10];
chr23 = p[11];
chr4 = p[12];
chr5 = p[13];
chr6 = p[14];
chr7 = p[15];
}
public override bool IsStateSave()
{
return true;
}
}
}