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by lieks
518 days ago
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If we're counting only programming languages (and not fill-out forms), Prolog had it in 1971, before ML. ASCII didn't include _ until its 1963 draft, so it's probably somewhere in that time. I'll guess it's probably Prolog, but maybe Planner (Prolog's predecessor) had it too. |
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The 1965 draft had _ https://dl.acm.org/doi/10.1145/363831.363839
The first standard edition with _ was 1968 https://www.rfc-editor.org/info/rfc20
The 1977 version is also available https://nvlpubs.nist.gov/nistpubs/Legacy/FIPS/fipspub1-2-197...