E(X)ecute APPLE3:LINEFEED to remedy the double spacing some printers show when
used with Pascal. The program can be transfered to the diskette you boot
(usually APPLE1: or APPLE0:) as SYSTEM.STARTUP and it will execute
automatically when the system is booted. You may also include the text of
this routine in your own programs; the text is also on the volume APPLE3:.