Oki 1220n User Manual page 59

If the software application being used has a collate print option, it is
recommended to use only one collate option to prevent any conflicts
in printing, i.e. collate from the software application or collate from the
printer driver.
The following instructions explain how to select collating using a
printer driver.
1. To access, first select your desired printer from an application
using File—Print..
2. The General
select General
dialog box should already be displayed. If not, then
from the menu.
ES 1220n Macintosh OS 9.x Operation • 59