The next major advance in modems was the Hayes Smartmodem, introduced in 1981. The Smartmodem was an otherwise standard 103A 300-bit/s modem, but it was attached to a small microcontroller that let the computer send it commands. The command set included instructions for picking up and hanging up the phone, dialing numbers, and answering calls. This eliminated the need for any manual operation, a handset, or a dialler. Terminal programs that maintained lists of phone numbers and sent the dialing commands became common. The basic Hayes command set remains the basis for computer control of most modern modems.