3.1.3 Compiler Listings
  A compiler listing provides information that can help you
  debug your BASIC program. To generate a listing file, spec-
  ify the /LISTING qualifier when you compile your BASIC
  program interactively. For example:
  $ BASIC/LISTING prog-name

  If the program is compiled as a batch job, the listing file is
  created by default; specify the /NOLISTING qualifier to sup-
  press creation of the listing file. By default, the name of the
  listing file is the name of the source program followed by the
  file type .LIS. You can include a file specification with the
  /LISTING qualifier to override this default.

  A compiler listing generated by the /LISTING qualifier has
  the following major sections:

  .
        Source Program Listing

        The source program section contains the source code and
        line numbers generated by the compiler.
  .
        Allocation Map

        The allocation map section contains summary informa-
        tion about program sections, variables, and arrays.
  .
        Qualifier Summary

        The qualifier summary section lists the qualifiers used
        with the BASIC command and the compilation statistics.