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DRV_BEGIN()
   Sets up the Clipper screen drivers for the graphics screen.

   Syntax
         DRV_BEGIN([nRows] [,nCols])

   Arguments
         OPTIONAL PARAMETERS
         nRows       Sets the number of rows.
         nCols       Sets the number of columns.

   Returns
         None

   Description
         DRV_BEGIN() sets up the Clipper screen drivers so Flipper will
         place the Clipper SAYs and GETs on the graphics screen. You should
         call DRV_FONT() first so that DRV_BEGIN() can use the height and
         width of the font to set the rows and columns to fit the monitor. If
         you want a virtual screen larger or smaller than the size of the
         monitor, use nRows and nCols to set the number of rows and columns.

         The color palette is the default Clipper palette. However, if
         you're working on a black and white graphics monitor, such as
         Hercules, then you will probably want to change the palette to black
         and white.