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GetAPen -- Get the A Pen value for a RastPort (V39).
pen = GetAPen ( rp )
d0 a0
ULONG GetAPen(struct RastPort *)
Return the current value of the A 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.
rp = a pointer to a valid RastPort structure.
SetAPen(), <graphics/gfx.h>
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