William Chops Westfield <billw@CISCO.COM> asks:
> Was the original PONG digital?  My brother built a version from plans
> in popular electronics that was done mostly in analog...

It was a mixture.  IIRC, it was mostly digital, but the player controls
(potentiometers) were part of the RC time constant for one-shots that
determined paddle vertical position.  The vertical sync pulse would trigger
the one-shot, and when it timed out the paddle started and a second one-shot
with a fixed time constant was triggered to time the paddle height.  The
paddle vertical position was anded with a digitally-derived horizontal
position to generate the actual paddle video.

The sounds were simply gated bits from the vertical counter.