Brother DCP-8020 - Manual (Page 190)

11 - 3 USING YOUR DCP WITH A MACINTOSH ®
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From application software such as Presto! ® PageManager ® ,
click File menu and select Print. Click Print to start printing.
If you want to change Copies, Pages, Resolution, Paper Source
and Media Type, select your settings before clicking Print.
Device Options allows you to select Duplex.
Automatic Duplex is only available with the DCP-8025D.