Lexmark C910 User Reference Manual page 302

MAC Binary PS
Purpose:
To configure the printer to process Macintosh binary PostScript print jobs.
Values:
On Printer processes raw binary PostScript print jobs from computers using the Macintosh
operating system.
Note: This setting often causes Windows print jobs to fail.
Off Printer filters PostScript print jobs using standard protocol.
Auto* Printer processes print jobs from computers using either Windows or Macintosh operating
systems.
NPA Mode
Purpose:
To specify whether the printer performs the special processing required for bidirectional
communication, following the conventions defined in the Network Printing Alliance (NPA) Protocol.
Values:
On Printer performs NPA processing. If data is not in NPA format, it is rejected as bad data.
Off Printer does not perform NPA processing.
Auto* Printer examines the data to determine the format and then processes it appropriately.
Note: Changing this menu item automatically resets the printer.
PCL SmartSwitch
Purpose:
To configure the printer so it automatically switches to PCL emulation when a print job received
through the USB port requires it, regardless of the default printer language.
Values:
On* Printer examines the data on the USB interface and selects PCL emulation if the data
indicates that is the required printer language.
Off Printer does not examine the incoming data. The printer uses PostScript emulation to
process the job if PS SmartSwitch is On, or uses the default printer language specified in the
Setup Menu if PS SmartSwitch is Off.
See also:
PS SmartSwitch; Printer Language
300