AxibugEmuOnline/Core/VirtualNes.Core/Mapper/Mapper041.cs

//////////////////////////////////////////////////////////////////////////
// Mapper041  Caltron 6-in-1                                            //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using BYTE = System.Byte;


namespace VirtualNes.Core
{
    public class Mapper041 : Mapper
    {
        BYTE[] reg = new byte[2];
        public Mapper041(NES parent) : base(parent)
        {
        }


        public override void Reset()
        {
            reg[0] = reg[1] = 0;

            SetPROM_32K_Bank(0, 1, 2, 3);

            if (VROM_1K_SIZE != 0)
            {
                SetVROM_8K_Bank(0);
            }
        }

        //void Mapper041::WriteLow(WORD addr, BYTE data)
        public override void WriteLow(ushort addr, byte data)
        {
            if (addr >= 0x6000 && addr < 0x6800)
            {
                SetPROM_32K_Bank(addr & 0x07);
                reg[0] = (byte)(addr & 0x04);
                reg[1] &= 0x03;
                reg[1] |= (byte)((addr >> 1) & 0x0C);
                SetVROM_8K_Bank(reg[1]);
                if ((addr & 0x20) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
                else SetVRAM_Mirror(VRAM_VMIRROR);
            }
        }

        //void Mapper041::Write(WORD addr, BYTE data)
        public override void Write(ushort addr, byte data)
        {
            if (reg[0] != 0)
            {
                reg[1] &= 0x0C;
                reg[1] |= (byte)(addr & 0x03);
                SetVROM_8K_Bank(reg[1]);
            }
        }

        //void Mapper041::SaveState(LPBYTE p)
        public override void SaveState(byte[] p)
        {
            p[0] = reg[0];
            p[1] = reg[1];
        }

        //void Mapper041::LoadState(LPBYTE p)
        public override void LoadState(byte[] p)
        {
            reg[0] = p[0];
            reg[1] = p[1];
        }


        public override bool IsStateSave()
        {
            return true;
        }
    }
}