Use the compiler directive /SPACE to control line spacing within the source section of the compiler listing.
/SPACE begins in column 7 or later.
It must be followed by exactly one blank, and then
followed by a positive integer value from 1 through 112
that defines the number
of lines to space on the compiler listing, followed
by at least two blanks.
The remaining columns can contain comments. 
/SPACE cannot be coded within a free-form statement. 
If the number of lines is greater than 112, 112
will be used as the /SPACE value. If the number of lines
is greater than the number of lines remaining on the current page,
subsequent specifications begin at the top of the next page. 
/SPACE is not printed on the compiler listing, but is replaced by the specified line spacing. The line spacing caused by /SPACE is in addition to the two lines that are skipped between specification types.