On 1/14/25 15:31, Van Snyder via cctalk wrote: > F90 was an extension to F77 and was entirely upwardly compatible with > it, not an entirely new language.
IMOHO, the most significant revision of the F77 standard by F90 was that is was acceptable to spell the last 6 letters of the language in lower case. (i.e. Fortran). In a way, that broke with the historical sense of the name. It should have been ForTran. (just kidding) F66 was important in a way, as vendor extensions had gone a bit wild. (e.g. punch a B in column 1 and the arithmetic operators become boolean. I think that was a feature in 7090 FMS/IBSYS). One defining characteristic of post-1980 languages was the assumption of a binary radix, as opposed to systems like the 1401 or 7070, which were decimal and lacked bitwise boolean operations. --Chuck
