Apple LaserWriter 12/640 PS - Manual (Page 260)

5 Choose printing on one side or both sides of the paper from the pop-up menu.
If you want the binding orientation along the side of the paper (like in a book
or magazine), choose “two-sided, no tumbling.” If you want the binding
orientation along the bottom side of the paper (like in a calendar), choose
“two-sided, with tumbling.”
Note: You must have the optional duplex printing unit to print on both sides
of the paper.
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)
6 Choose the output tray from the pop-up menu.
Face Down output tray is the default. This tray is located on the top of the
printer and stacks the output media face down.
The Face Up output reduces the curl of your paper by using a “straight-
through” paper path through the printer. This is useful when you print on
heavy media, such as transparencies, envelopes, and postcards.
Note: You can use Face Up output with or without the optional face-up
output tray. However, the face-up output tray stacks the papers neatly in
a tray instead of on the surface where the printer is located.
7 Click Send to send the paper-handling settings to the printer.
260 Appendix A