https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98825
--- Comment #6 from Jerry DeLisle <jvdelisle at charter dot net> --- I found the DEC F77 reference. I wanted to capture this somewhere for future reference: o MESSAGE: Extension to FORTRAN-77: nonstandard FORMAT statement item EXPLANATION: The following format field descriptors are extensions to FORTRAN-77: Descriptor Aspect ---------- ------ $ All forms A,L,I,F,E,G,D Default field width forms P Without scale factor and then: $ In a format specification, the dollar sign character ($) modifies the carriage control specified by the first character of the record. It only affects the files for which the 'FORTRAN' carriage control attribute is in effect. On U*X systems, it also affects files if 'LIST' is in effect. In an input statement, the $ descriptor is ignored. In an output statement, the following rules apply: - If the first character of the record is 0, 1, or ASCII NUL, the $ descriptor is ignored. - If the first character of the record is a space or plus sign (+), the $ descriptor suppresses carriage return (after printing the record). For terminal I/O, whenever trailing carriage return control is suppressed by the $ descriptor, a typed response follows output on the same line. I am working on it.