I am trying to print a booklet to a postscript file from InDesign. The booklet is letter-half and 8 pages (5 spreads) with all pages on a portrait orientation. For printer I select Postscript which greys out the ability to pick paper size or orientation. When I check the preview the orientaton looks correct (2 portrait half pages side by side on each sheet of landscape paper) but when I generate the postscript file the orientation is wrong (2 portrait half sheets side by side on each sheet of portrait paper). I have been able to verify that the incorrect orientation was output when the Postscript was written by viewing the file using several different apps on different platforms.
Running InDesign CS6 8.0.1 on OS X 10.8.2
You need the ADPDF9 ppd. I believe you'll find a link for it at Creating PostScript Files in Snow Leopard for Older Print Workflows | InDesignSecrets
There were issues in the past with Fiery printers printing wrong orientations while printing to postscript using its drivers. Device independent is a generic postscript printer driver and that should give you the right output. What model is your printer? Do you have the printer drivers updated for your printer from the manufacterer website already?