NAME   
        SetBPen -- Set secondary pen for a rastport

   SYNOPSIS
        SetBPen( rp, pen )
                 a1  d0

        void SetBPen( struct rastport *, ubyte );

   FUNCTION
        Set the secondary drawing pen for lines, fills, and text.

   INPUTS
        rp - pointer to rastport structure.
        pen - (0-255)

   RESULT
        Changes the minterms in the rastport to reflect new secondary pen.
        Sets line drawer to restart pattern.

   BUGS

    SEE ALSO
        setapen() graphics/rastport.h