The 2600 had paddles & "driving controllers". The former were potentiometers, the latter used quadrature encoding like a mouse. All the Pong (and clone) contro

The 2600 had paddles & "driving controllers". The former were potentiometers, the latter used quadrature encoding like a mouse. All the Pong (and clone) controllers I've come across were analog. But the Fairchild Channel F's controllers were digital.