forked from sin365/AxibugEmuOnline
135 lines
3.4 KiB
C#
135 lines
3.4 KiB
C#
//////////////////////////////////////////////////////////////////////////
|
|
// Mapper004 Supor Computer V4.0 //
|
|
//////////////////////////////////////////////////////////////////////////
|
|
using static VirtualNes.MMU;
|
|
using BYTE = System.Byte;
|
|
|
|
|
|
namespace VirtualNes.Core
|
|
{
|
|
public class Mapper167 : Mapper
|
|
{
|
|
BYTE[] regs = new byte[4];
|
|
BYTE rom_type;
|
|
public Mapper167(NES parent) : base(parent)
|
|
{
|
|
}
|
|
|
|
public override void Reset()
|
|
{
|
|
uint crc;
|
|
|
|
regs[0] = 0;
|
|
regs[1] = 0;
|
|
regs[2] = 0;
|
|
regs[3] = 0;
|
|
|
|
crc = nes.rom.GetPROM_CRC();
|
|
if (crc == 0x82F1Fb96)
|
|
{
|
|
// Subor Computer(Russia)
|
|
rom_type = 1;
|
|
}
|
|
else
|
|
{
|
|
// Subor Computer(Chinese)
|
|
rom_type = 0;
|
|
}
|
|
|
|
SetBank_CPU();
|
|
SetBank_PPU();
|
|
}
|
|
|
|
//void Mapper167::Write(WORD addr, BYTE data)
|
|
public override void Write(ushort addr, byte data)
|
|
{
|
|
int idx;
|
|
|
|
idx = (addr >> 13) & 0x03;
|
|
regs[idx] = data;
|
|
SetBank_CPU();
|
|
SetBank_PPU();
|
|
// DEBUGOUT("write to %04x:%02x\n", addr, data);
|
|
}
|
|
|
|
|
|
void SetBank_CPU()
|
|
{
|
|
int @base, bank;
|
|
|
|
@base = ((regs[0] ^ regs[1]) & 0x10) << 1;
|
|
bank = (regs[2] ^ regs[3]) & 0x1f;
|
|
|
|
if ((regs[1] & 0x08) != 0)
|
|
{
|
|
bank &= 0xfe;
|
|
if (rom_type == 0)
|
|
{
|
|
SetPROM_16K_Bank(4, @base + bank + 1);
|
|
SetPROM_16K_Bank(6, @base + bank + 0);
|
|
}
|
|
else
|
|
{
|
|
SetPROM_16K_Bank(6, @base + bank + 1);
|
|
SetPROM_16K_Bank(4, @base + bank + 0);
|
|
}
|
|
// DEBUGOUT("32K MODE!\n");
|
|
}
|
|
else
|
|
{
|
|
if ((regs[1] & 0x04) != 0)
|
|
{
|
|
SetPROM_16K_Bank(4, 0x1f);
|
|
SetPROM_16K_Bank(6, @base + bank);
|
|
// DEBUGOUT("HIGH 16K MODE!\n");
|
|
}
|
|
else
|
|
{
|
|
SetPROM_16K_Bank(4, @base + bank);
|
|
if (rom_type == 0)
|
|
{
|
|
SetPROM_16K_Bank(6, 0x20);
|
|
}
|
|
else
|
|
{
|
|
SetPROM_16K_Bank(6, 0x07);
|
|
}
|
|
// DEBUGOUT("LOW 16K MODE!\n");
|
|
}
|
|
}
|
|
|
|
|
|
}
|
|
|
|
void SetBank_PPU()
|
|
{
|
|
SetCRAM_8K_Bank(0);
|
|
}
|
|
|
|
//void Mapper167::SaveState(LPBYTE p)
|
|
public override void SaveState(byte[] p)
|
|
{
|
|
p[0] = regs[0];
|
|
p[1] = regs[1];
|
|
p[2] = regs[2];
|
|
p[3] = regs[3];
|
|
p[4] = rom_type;
|
|
}
|
|
|
|
//void Mapper167::LoadState(LPBYTE p)
|
|
public override void LoadState(byte[] p)
|
|
{
|
|
regs[0] = p[0];
|
|
regs[1] = p[1];
|
|
regs[2] = p[2];
|
|
regs[3] = p[3];
|
|
rom_type = p[4];
|
|
}
|
|
|
|
public override bool IsStateSave()
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
}
|