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SET_DISPLY()
   Sets the monitor type.

   Syntax
         SET_DISPLY(nDisplayNumber)

   Arguments
         nDisplayNumber Sets the type of monitor to be used.

   Returns
         RET_DISPLY()   Returns the display number.

   Description
         FLIPPER will attempt to automatically detect what hardware you have
         in your computer and set the graphics mode except under the
         following conditions:
                  * when two monitors are attached
                  * certain types of non-standard graphics cards
         When the correct mode can not be determined, you must use
         SET_DISPLY() to set the correct monitor type. If you have a color
         system and are unsure about which mode you have, start with mode 1
         (CGA). If you have a monochrome system then start with mode 9.

         When issuing the SET_DISPLY(nDisplayNumber), enter the number of the
         display you have:
                  1 - CGA
                  3 - EGA
                  4 - VGA
                  5 - Double scan AT&T 6300 type
                  9 - HERCULES