NAME
    SetAPen -- Set the primary pen for a rastport.
SYNOPSIS
    SetAPen( rp, pen )
             a1  d0
    void SetAPen( struct rastport *, ubyte );
FUNCTION
    Set the primary 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 primary pen.
    Sets line drawer to restart pattern.
BUGS
SEE ALSO
    setbpen() graphics/rastport.h