A scruffy, young Steve Jobs worked at Atari before he founded Apple. “Pong,” one of the world’s first video games, was born there, as was “Centipede,” a classic from the era of quarter-guzzling arcade machines. “Call of Duty” creator Activision was started by four of Atari’s former game developers.

The iconic video game company turns 40 years old this week, much slimmer these days as it tries to stay relevant in the age of “Angry Birds” and “Words With Friends.”

But Atari’s influence on today’s video games is pervasive.