SIC has the following usage of Fortran logical unit numbers:
5 Input of Commands, shareable
6 Output of messages, shareable
50 to 99 Used by SIC_GETLUN
Units 5 and 6 are respectively accessed via usual READ and WRITE instructions.
If you wish to be able to reassign the input or/and output of your
program to a file, you should also make your input and output in the same
way (or use the SIC_WPR, SIC_WPRN routine). If you mix READ(5,format) and WRITE(6,format) instructions with PRINT, READ(*,format) or WRITE(*,format) instructions, you might experience
some problem. Mixing with C output (printf routine for example)
may yield to disordered output because of buffering. Use of routine
GAGOUT is recommended to printout messages.
Units 50 to 99 are assumed to be available for the routine SIC_GETLUN . This subroutine returns the next available logical unit in this range, and keeps track of their usage. Conflict may occur if the user directly opens a file under a unit in this range without allocating the unit through a call to SIC_GETLUN. Other units are never used by SIC and other GILDAS programs.