AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper105.cs
2024-08-04 23:37:02 +08:00

203 lines
4.0 KiB
C#

//////////////////////////////////////////////////////////////////////////
// Mapper105 Nintendo World Championship //
//////////////////////////////////////////////////////////////////////////
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 Mapper105 : Mapper
{
BYTE init_state;
BYTE write_count;
BYTE bits;
BYTE[] reg = new byte[4];
BYTE irq_enable;
INT irq_counter;
public Mapper105(NES parent) : base(parent)
{
}
public override void Reset()
{
SetPROM_32K_Bank(0);
reg[0] = 0x0C;
reg[1] = 0x00;
reg[2] = 0x00;
reg[3] = 0x10;
bits = 0;
write_count = 0;
irq_counter = 0;
irq_enable = 0;
init_state = 0;
}
//void Mapper105::Write(WORD addr, BYTE data)
public override void Write(ushort addr, byte data)
{
//WORD reg_num = (addr & 0x7FFF) >> 13;
uint reg_num = (byte)((addr & 0x7FFF) >> 13);
if ((data & 0x80) != 0)
{
bits = write_count = 0;
if (reg_num == 0)
{
reg[reg_num] |= 0x0C;
}
}
else
{
//bits |= (data & 1) << write_count++;
bits |= (byte)((data & 1) << write_count++);
if (write_count == 5)
{
reg[reg_num] = (byte)(bits & 0x1F);
bits = write_count = 0;
}
}
if ((reg[0] & 0x02) != 0)
{
if ((reg[0] & 0x01) != 0)
{
SetVRAM_Mirror(VRAM_HMIRROR);
}
else
{
SetVRAM_Mirror(VRAM_VMIRROR);
}
}
else
{
if ((reg[0] & 0x01) != 0)
{
SetVRAM_Mirror(VRAM_MIRROR4H);
}
else
{
SetVRAM_Mirror(VRAM_MIRROR4L);
}
}
switch (init_state)
{
case 0:
case 1:
init_state++;
break;
case 2:
if ((reg[1] & 0x08) != 0)
{
if ((reg[0] & 0x08) != 0)
{
if ((reg[0] & 0x04) != 0)
{
SetPROM_8K_Bank(4, ((reg[3] & 0x07) * 2 + 16));
SetPROM_8K_Bank(5, ((reg[3] & 0x07) * 2 + 17));
SetPROM_8K_Bank(6, 30);
SetPROM_8K_Bank(7, 31);
}
else
{
SetPROM_8K_Bank(4, 16);
SetPROM_8K_Bank(5, 17);
SetPROM_8K_Bank(6, ((reg[3] & 0x07) * 2 + 16));
SetPROM_8K_Bank(7, ((reg[3] & 0x07) * 2 + 17));
}
}
else
{
SetPROM_8K_Bank(4, ((reg[3] & 0x06) * 2 + 16));
SetPROM_8K_Bank(5, ((reg[3] & 0x06) * 2 + 17));
SetPROM_8K_Bank(6, ((reg[3] & 0x06) * 2 + 18));
SetPROM_8K_Bank(7, ((reg[3] & 0x06) * 2 + 19));
}
}
else
{
SetPROM_8K_Bank(4, ((reg[1] & 0x06) * 2 + 0));
SetPROM_8K_Bank(5, ((reg[1] & 0x06) * 2 + 1));
SetPROM_8K_Bank(6, ((reg[1] & 0x06) * 2 + 2));
SetPROM_8K_Bank(7, ((reg[1] & 0x06) * 2 + 3));
}
if ((reg[1] & 0x10) != 0)
{
irq_counter = 0;
irq_enable = 0;
}
else
{
irq_enable = 1;
}
// nes.cpu.ClrIRQ( IRQ_MAPPER );
break;
default:
break;
}
}
//void Mapper105::HSync(INT scanline)
public override void HSync(int scanline)
{
if (scanline != 0)
{
if (irq_enable != 0)
{
irq_counter += 29781;
}
if (((irq_counter | 0x21FFFFFF) & 0x3E000000) == 0x3E000000)
{
// nes.cpu.IRQ_NotPending();
// nes.cpu.SetIRQ( IRQ_MAPPER );
nes.cpu.SetIRQ(IRQ_TRIGGER2);
}
}
}
//void Mapper105::SaveState(LPBYTE p)
public override void SaveState(byte[] p)
{
//for (INT i = 0; i < 4; i++)
//{
// p[i] = reg[i];
//}
//p[8] = init_state;
//p[9] = write_count;
//p[10] = bits;
//p[11] = irq_enable;
//*((INT*)&p[12]) = irq_counter;
}
//void Mapper105::LoadState(LPBYTE p)
public override void LoadState(byte[] p)
{
//for (INT i = 0; i < 4; i++)
//{
// reg[i] = p[i];
//}
//init_state = p[8];
//write_count = p[9];
//bits = p[10];
//irq_enable = p[11];
//irq_counter = *((INT*)&p[12]);
}
public override bool IsStateSave()
{
return true;
}
}
}