EGA Lines                                      
Alt + F9

 This command toggles the display between 25- and 43-line
 modes (on an EGA) or 25- and 50-line modes (on a VGA).

   Note:  On some systems, the ANSI.SYS driver (loaded in the
          \config.sys file) limits DOS output to the first 25
          lines of the screen.  To use more lines, remove
          ANSI.SYS from \config.sys.