This pair of fun articles traces a search for the author of the first known software easter egg, which turns out to date to late 1967 or 1968:
We’ve seen easter eggs before in Windows here and alleged C64 easter eggs here.
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I recall the CP/M text editor “TED” which allowed manual insertion of control characters, unless you tried to insert a ^Z (CP/M end-of-file) when the screen would respond “Turkey!”
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