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   NAME
       GetOPen -- Get the O Pen value for a rastport (v39).


   SYNOPSIS
       pen = GetOPen  ( rp )
        d0               a0

        ULONG GetOPen(struct rastport *)

   FUNCTION
        Return the current value of the O pen for the rastport. This function
        should be used instead of peeking the structure directly, because future
        graphics devices may store it differently, for instance, using more bits.

   INPUTS
       rp  =  a pointer to a valid rastport structure.

   BUGS

   NOTES

   SEE ALSO
        setoutlinepen() graphics/gfx.h