AxibugEmuOnline/AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper075.cs

//////////////////////////////////////////////////////////////////////////
// Mapper075  Konami VRC1/Jaleco D65005                                 //
//////////////////////////////////////////////////////////////////////////
using static VirtualNes.MMU;
using BYTE = System.Byte;


namespace VirtualNes.Core
{
    public class Mapper075 : Mapper
    {
        BYTE[] reg = new byte[2];
        public Mapper075(NES parent) : base(parent)
        {
        }

        public override void Reset()

        {
            SetPROM_32K_Bank(0, 1, PROM_8K_SIZE - 2, PROM_8K_SIZE - 1);

            if (VROM_8K_SIZE != 0)
            {
                SetVROM_8K_Bank(0);
            }
            reg[0] = 0;
            reg[1] = 1;
        }

        //void Mapper075::Write(WORD addr, BYTE data)
        public override void Write(ushort addr, byte data)
        {
            switch (addr & 0xF000)
            {
                case 0x8000:
                    SetPROM_8K_Bank(4, data);
                    break;

                case 0x9000:
                    if ((data & 0x01) != 0) SetVRAM_Mirror(VRAM_HMIRROR);
                    else SetVRAM_Mirror(VRAM_VMIRROR);

                    reg[0] = (byte)((reg[0] & 0x0F) | ((data & 0x02) << 3));
                    reg[1] = (byte)((reg[1] & 0x0F) | ((data & 0x04) << 2));
                    SetVROM_4K_Bank(0, reg[0]);
                    SetVROM_4K_Bank(4, reg[1]);
                    break;

                case 0xA000:
                    SetPROM_8K_Bank(5, data);
                    break;
                case 0xC000:
                    SetPROM_8K_Bank(6, data);
                    break;

                case 0xE000:
                    reg[0] = (byte)((reg[0] & 0x10) | (data & 0x0F));
                    SetVROM_4K_Bank(0, reg[0]);
                    break;

                case 0xF000:
                    reg[1] = (byte)((reg[1] & 0x10) | (data & 0x0F));
                    SetVROM_4K_Bank(4, reg[1]);
                    break;
            }
        }

        //void Mapper075::SaveState(LPBYTE p)
        public override void SaveState(byte[] p)
        {
            p[0] = reg[0];
            p[1] = reg[1];
        }

        //void Mapper075::LoadState(LPBYTE p)
        public override void LoadState(byte[] p)
        {
            reg[0] = p[0];
            reg[1] = p[1];
        }

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