def create_from_userdata(userdata):
        """Create ALDB Record from the userdata dictionary."""
        memhi = userdata.get('d3')
        memlo = userdata.get('d4')
        memory = memhi << 8 | memlo
        control_flags = userdata.get('d6')
        group = userdata.get('d7')
        addrhi = userdata.get('d8')
        addrmed = userdata.get('d9')
        addrlo = userdata.get('d10')
        addr = Address(bytearray([addrhi, addrmed, addrlo]))
        data1 = userdata.get('d11')
        data2 = userdata.get('d12')
        data3 = userdata.get('d13')
        return ALDBRecord(memory, control_flags, group, addr,
                          data1, data2, data3)
Create ALDB Record from the userdata dictionary.