AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper099.cs

//////////////////////////////////////////////////////////////////////////
// Mapper099  VS-Unisystem                                              //
//////////////////////////////////////////////////////////////////////////
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 Mapper099 : Mapper
	{
		BYTE coin;
		public Mapper099(NES parent) : base(parent)
		{
		}

		public override void Reset()
		{
			// set CPU bank pointers
			if (PROM_8K_SIZE > 2)
			{
				SetPROM_32K_Bank(0, 1, 2, 3);
			}
			else if (PROM_8K_SIZE > 1)
			{
				SetPROM_32K_Bank(0, 1, 0, 1);
			}
			else
			{
				SetPROM_32K_Bank(0, 0, 0, 0);
			}

			// set VROM bank
			if (VROM_1K_SIZE != 0)
			{
				SetVROM_8K_Bank(0);
			}

			coin = 0;
		}

		//BYTE Mapper099::ExRead(WORD addr)
		public override byte ExRead(ushort addr)
		{
			if (addr == 0x4020)
			{
				return coin;
			}

			return (byte)(addr >> 8);
		}

		//void Mapper099::ExWrite(WORD addr, BYTE data)
		public override void ExWrite(ushort addr, byte data)
		{
			if (addr == 0x4016)
			{
				if ((data & 0x04) != 0)
				{
					SetVROM_8K_Bank(1);
				}
				else
				{
					SetVROM_8K_Bank(0);
				}

				if (nes.rom.GetPROM_CRC() == 0xC99EC059)
				{   // VS Raid on Bungeling Bay(J)
					if ((data & 0x02) != 0)
					{
						nes.cpu.SetIRQ(IRQ_MAPPER);
					}
					else
					{
						nes.cpu.ClrIRQ(IRQ_MAPPER);
					}
				}
			}

			if (addr == 0x4020)
			{
				coin = data;
			}
		}


	}
}