Panasonic 150P - Manual (Page 56)

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Advanced...
Layout Tab
Orientation
Select portrait (vertical) or landscape (horizontal).
Print on Both Sides (Duplex) [DP-150FX only]
Specify duplex printing for printing on both sides.
Select the binding side (None/Flip on Short Edge/Flip on Long Edge) for duplex printing.
Note: Duplex Printing on Invoice/A5 is not supported.
button
Specify detailed settings. Refer to Advanced 62 for details. (See page 58)
Installation and Configuration (Windows 2000)