private void SkipIfChain()
        {
            byte opcode;
            do
            {
                cycles--;
                ushort instruction = Memory[PC++];
                opcode = (byte)(instruction & 0x1F);
                byte valueB = (byte)((instruction & 0x3E0) >> 5);
                byte valueA = (byte)((instruction & 0xFC00) >> 10);
                ushort SP_old = SP;
                Get(valueA);
                Get(valueB);
                SP = SP_old;
            } while (opcode >= 0x10 && opcode <= 0x17);
        }