f66, f77, & f90

Filename extensions: f66, f77, & f90

(related variations: f66 f77 f90)
A source file written in the ForTran programming language. It should be in simple ASCII and (depending upon how portably it was written) should be usable on any machine with a ForTran compiler. The only caution is that the number refers to the version of ForTran used.