Apple LaserWriter 12/640 PS - Manual (Page 263)

Setting duplex printing options
Choose the More Options button in the Paper tab dialog box to display the
More Paper Options dialog box, used to specify duplex print settings.
If your LaserWriter has been upgraded to a minimum of 12 MB of memory,
and you’ve installed the optional duplex printing unit, you can duplex print.
If you want to You need this much printer memory
Turn on PhotoGrade or use the 12 MB
duplex printing option
Turn on PhotoGrade and duplex 20 MB
print on all size paper (except legal)
Turn on PhotoGrade and duplex 24 MB
print on all size paper (including legal)
m Printing on both sides Lets you define how to duplex print. Select None to
print only on one side. Select Flip on Long Edge if you want the binding
orientation along the long edge of the paper (such as in a book or
magazine). Select Flip on Short Edge if you want the binding orientation
along the short edge of the paper (such as in a calendar).
m Output bin Selects which tray to use as the output.
238 Chapter 8