Computer Operating System Since 1969 Crossword Clue — 4 Letters

One confident answer with explanation of the wordplay

UNIX
Best match
U
N
I
X

UNIX is the computer operating system developed at Bell Labs starting in 1969, making it a perfect fit for this clue. It is exactly 4 letters long.

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Other possible answers
UROSLess likely, but another early OS acronym possibility.
BEOSBeOS is a computer operating system, though from the 1990s, not 1969.
IRIXIRIX is a UNIX-based OS by SGI, but dates from the 1980s, not 1969.

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