AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper165.cs

196 lines
5.1 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper165 Fire Emblem Chinese version //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using BYTE = System.Byte;
using INT = System.Int32;
namespace VirtualNes.Core
{
public class Mapper165 : Mapper
{
BYTE[] reg = new byte[8];
BYTE prg0, prg1;
BYTE chr0, chr1, chr2, chr3;
BYTE we_sram;
BYTE latch;
public Mapper165(NES parent) : base(parent)
{
}
public override void Reset()
{
for (INT i = 0; i < 8; i++)
{
reg[i] = 0x00;
}
prg0 = 0;
prg1 = 1;
SetBank_CPU();
chr0 = 0;
chr1 = 0;
chr2 = 4;
chr3 = 4;
latch = 0xFD;
SetBank_PPU();
we_sram = 0; // Disable
nes.ppu.SetChrLatchMode(true);
}
//void Mapper165::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:
chr0 = (byte)(data & 0xFC);
if (latch == 0xFD)
SetBank_PPU();
break;
case 0x01:
chr1 = (byte)(data & 0xFC);
if (latch == 0xFE)
SetBank_PPU();
break;
case 0x02:
chr2 = (byte)(data & 0xFC);
if (latch == 0xFD)
SetBank_PPU();
break;
case 0x04:
chr3 = (byte)(data & 0xFC);
if (latch == 0xFE)
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;
default:
break;
}
}
void SetBank_CPU()
{
SetPROM_32K_Bank(prg0, prg1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);
}
void SetBank_PPU()
{
if (latch == 0xFD)
{
SetBank_PPUSUB(0, chr0);
SetBank_PPUSUB(4, chr2);
}
else
{
SetBank_PPUSUB(0, chr1);
SetBank_PPUSUB(4, chr3);
}
}
void SetBank_PPUSUB(int bank, int page)
{
if (page == 0)
{
SetCRAM_4K_Bank((byte)bank, page >> 2);
}
else
{
SetVROM_4K_Bank((byte)bank, page >> 2);
}
}
//void Mapper165::PPU_ChrLatch(WORD addr)
public override void PPU_ChrLatch(ushort addr)
{
ushort mask = (ushort)(addr & 0x1FF0);
if (mask == 0x1FD0)
{
latch = 0xFD;
SetBank_PPU();
}
else if (mask == 0x1FE0)
{
latch = 0xFE;
SetBank_PPU();
}
}
//void Mapper165::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] = chr0;
p[11] = chr1;
p[12] = chr2;
p[13] = chr3;
p[14] = latch;
}
//void Mapper165::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];
chr0 = p[10];
chr1 = p[11];
chr2 = p[12];
chr3 = p[13];
latch = p[14];
}
}
}