AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper047.cs
2024-08-05 00:44:30 +08:00

276 lines
5.5 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper047 NES-QJ //
//////////////////////////////////////////////////////////////////////////
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 Mapper047 : Mapper
{
BYTE[] reg = new byte[8];
BYTE patch;
BYTE bank;
BYTE prg0, prg1;
BYTE chr01, chr23, chr4, chr5, chr6, chr7;
BYTE irq_enable;
BYTE irq_counter;
BYTE irq_latch;
public Mapper047(NES parent) : base(parent)
{
}
public override void Reset()
{
patch = 0;
if (nes.rom.GetPROM_CRC() == 0x7eef434c)
{
patch = 1;
}
for (INT i = 0; i < 8; i++)
{
reg[i] = 0;
}
bank = 0;
prg0 = 0;
prg1 = 1;
// set VROM banks
if (VROM_1K_SIZE != 0)
{
chr01 = 0;
chr23 = 2;
chr4 = 4;
chr5 = 5;
chr6 = 6;
chr7 = 7;
}
else
{
chr01 = chr23 = chr4 = chr5 = chr6 = chr7 = 0;
}
SetBank_CPU();
SetBank_PPU();
irq_enable = 0;
irq_counter = 0;
irq_latch = 0;
}
//void Mapper047::WriteLow(WORD addr, BYTE data)
public override void WriteLow(ushort addr, byte data)
{
if (addr == 0x6000)
{
if (patch != 0)
{
bank = (byte)((data & 0x06) >> 1);
}
else
{
bank = (byte)((data & 0x01) << 1);
}
SetBank_CPU();
SetBank_PPU();
}
}
//void Mapper047::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:
prg0 = data;
SetBank_CPU();
break;
case 0x07:
prg1 = data;
SetBank_CPU();
break;
}
break;
case 0xA000:
reg[2] = data;
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;
irq_counter = data;
break;
case 0xC001:
reg[5] = data;
irq_latch = data;
break;
case 0xE000:
reg[6] = data;
irq_enable = 0;
nes.cpu.ClrIRQ(IRQ_MAPPER);
break;
case 0xE001:
reg[7] = data;
irq_enable = 1;
break;
}
}
//void Mapper047::HSync(INT scanline)
public override void HSync(int scanline)
{
if ((scanline >= 0 && scanline <= 239))
{
if (nes.ppu.IsDispON())
{
if (irq_enable != 0)
{
if ((--irq_counter) == 0)
{
irq_counter = irq_latch;
// nes.cpu.IRQ();
nes.cpu.SetIRQ(IRQ_MAPPER);
}
}
}
}
}
void SetBank_CPU()
{
if ((reg[0] & 0x40) != 0)
{
SetPROM_8K_Bank(4, bank * 8 + ((patch != 0 && bank != 2) ? 6 : 14));
SetPROM_8K_Bank(5, bank * 8 + prg1);
SetPROM_8K_Bank(6, bank * 8 + prg0);
SetPROM_8K_Bank(7, bank * 8 + ((patch != 0 && bank != 2) ? 7 : 15));
}
else
{
SetPROM_8K_Bank(4, bank * 8 + prg0);
SetPROM_8K_Bank(5, bank * 8 + prg1);
SetPROM_8K_Bank(6, bank * 8 + ((patch != 0 && bank != 2) ? 6 : 14));
SetPROM_8K_Bank(7, bank * 8 + ((patch != 0 && bank != 2) ? 7 : 15));
}
}
void SetBank_PPU()
{
if (VROM_1K_SIZE != 0)
{
if ((reg[0] & 0x80) != 0)
{
SetVROM_1K_Bank(0, (bank & 0x02) * 64 + chr4);
SetVROM_1K_Bank(1, (bank & 0x02) * 64 + chr5);
SetVROM_1K_Bank(2, (bank & 0x02) * 64 + chr6);
SetVROM_1K_Bank(3, (bank & 0x02) * 64 + chr7);
SetVROM_1K_Bank(4, (bank & 0x02) * 64 + chr01 + 0);
SetVROM_1K_Bank(5, (bank & 0x02) * 64 + chr01 + 1);
SetVROM_1K_Bank(6, (bank & 0x02) * 64 + chr23 + 0);
SetVROM_1K_Bank(7, (bank & 0x02) * 64 + chr23 + 1);
}
else
{
SetVROM_1K_Bank(0, (bank & 0x02) * 64 + chr01 + 0);
SetVROM_1K_Bank(1, (bank & 0x02) * 64 + chr01 + 1);
SetVROM_1K_Bank(2, (bank & 0x02) * 64 + chr23 + 0);
SetVROM_1K_Bank(3, (bank & 0x02) * 64 + chr23 + 1);
SetVROM_1K_Bank(4, (bank & 0x02) * 64 + chr4);
SetVROM_1K_Bank(5, (bank & 0x02) * 64 + chr5);
SetVROM_1K_Bank(6, (bank & 0x02) * 64 + chr6);
SetVROM_1K_Bank(7, (bank & 0x02) * 64 + chr7);
}
}
}
//void Mapper047::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;
p[16] = irq_enable;
p[17] = irq_counter;
p[18] = irq_latch;
p[19] = bank;
}
//void Mapper047::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];
irq_enable = p[16];
irq_counter = p[17];
irq_latch = p[18];
bank = p[19];
}
}
}