According to the wikipedia article on the topic, the earliest executable compressor listed is Realia Spacemaker for IBM PC (since 1982, written by Robert B. K. Dewar, SM.COM, signature "MEMORY$").

One of the pages referred by the wiki entry claims that the distinction of being the first executable compressor almost certainly belongs to Realia SpaceMaker. It could as well be, given that SpaceMaker compresses runs of repeated zero bytes—but only zero bytes (I cannot think of anything more basic than that), but is that actually true?

Was there an earlier executable compressor tool advertised as such on any pre-IBM PC computer?

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