Read the manual to Pong (1976)

The manual for Atari's classic game (posted to flickr by Brian Bennett exactly ten years ago) is not a masterpiece of design. But it is beautiful, in its way, and I strongly approve of that particular shade of orange. Sadly, your ninety-day warranty is over.

Pong (1976) [via]

P.S. there are all sorts of manuals for early arcade games, including Pong, at Textfiles.org.