Fortran Programming Guide

Using TOPEN Routines

With the nonstandard tape I/O package (see topen(3F)) you can transfer blocks between the tape drive and buffers declared as Fortran character variables. You can then use internal I/O to fill and empty these buffers. This facility does not integrate with the rest of Fortran I/O and even has its own set of tape logical units. Refer to the man pages for complete information.