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