AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper050.cs

//////////////////////////////////////////////////////////////////////////
// Mapper050  SMB2J                                                     //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.Core.CPU;
using static VirtualNes.MMU;
using BYTE = System.Byte;


namespace VirtualNes.Core
{
    public class Mapper050 : Mapper
    {
        BYTE irq_enable;
        public Mapper050(NES parent) : base(parent)
        {
        }

        public override void Reset()
        {
            irq_enable = 0;
            SetPROM_8K_Bank(3, 15);
            SetPROM_8K_Bank(4, 8);
            SetPROM_8K_Bank(5, 9);
            SetPROM_8K_Bank(6, 0);
            SetPROM_8K_Bank(7, 11);
            if (VROM_1K_SIZE != 0)
            {
                SetVROM_8K_Bank(0);
            }
        }

        //void Mapper050::ExWrite(WORD addr, BYTE data)
        public override void ExWrite(ushort addr, byte data)
        {
            if ((addr & 0xE060) == 0x4020)
            {
                if ((addr & 0x0100) != 0)
                {
                    irq_enable = (byte)(data & 0x01);
                    nes.cpu.ClrIRQ(IRQ_MAPPER);
                }
                else
                {
                    SetPROM_8K_Bank(6, (data & 0x08) | ((data & 0x01) << 2) | ((data & 0x06) >> 1));
                }
            }
        }

        //void Mapper050::WriteLow(WORD addr, BYTE data)
        public override void WriteLow(ushort addr, byte data)
        {
            if ((addr & 0xE060) == 0x4020)
            {
                if ((addr & 0x0100) != 0)
                {
                    irq_enable = (byte)(data & 0x01);
                    nes.cpu.ClrIRQ(IRQ_MAPPER);
                }
                else
                {
                    SetPROM_8K_Bank(6, (data & 0x08) | ((data & 0x01) << 2) | ((data & 0x06) >> 1));
                }
            }
        }

        //void Mapper050::HSync(INT scanline)
        public override void HSync(int scanline)
        {
            if (irq_enable != 0)
            {
                if (scanline == 21)
                {
                    //			nes.cpu.IRQ();
                    nes.cpu.SetIRQ(IRQ_MAPPER);
                }
            }
        }

        //void Mapper050::SaveState(LPBYTE p)
        public override void SaveState(byte[] p)
        {
            p[0] = irq_enable;
        }

        //void Mapper050::LoadState(LPBYTE p)
        public override void LoadState(byte[] p)
        {
            irq_enable = p[0];
        }


        public override bool IsStateSave()
        {
            return true;
        }

    }
}