Waxy points us to a post on the blog The History Of How We Play (at thehistoryofhowweplay.wordpress.com, natch) explaining the practice of arcade game developers putting their initials on the default vanity boards of arcade machines, as some small way of getting their names into a public piece of software they had created, at a time when many companies tried to keep that knowledge secret. As the article says, this process slowly receded, as both arcade games relied less on high score chasing for their appeal, and as arcade games began to get actual credit sequences for players to see.
A few of their many screenshots:
Arcade Authorship – High Score Table Credits
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