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Comment by dfawcus | Hacker News Reader

Metaware High-C version 1.2 (Nov 1985) had underscores in floating point and integer literals. Possibly it had that even earlier.

Possibly also taken from Ada, as other text in that section of the manual reference Ada.

I did not know that. Thanks for pointing it out.

mind, it is also possible that they took that from Algol 68, and 'adjusted it':

  $ a68g --strict -e '(INT a = 1 000; print((a,newline)) )'
        +1000

As Algol 68 allows spaces within numbers, as well as within identifiers.