Lexmark T630n VE Reference Manual page 220

Your printer defaults to the forward compatibility mode and the Lexmark PostScript
driver uses this mode. For backward compatibility with the Lexmark Optra S family of
printers, use the latest version of the Lexmark Optra S driver which sends the
PostScript command to switch to backward compatibility mode. (The original Lexmark
Optra S driver does not send this command.)
See Table 4-6 to determine which Lexmark Optra S driver you should use.
Table 4-6: Lexmark Optra S Drivers
If you need the Lexmark Optra S driver for ...
Windows 2000, Windows XP
Windows NT 4.0
Windows 9x, Windows Millennium Edition (Me)
Windows 3.x
The PostScript commands to switch the compatibility modes are:
Forward compatibility:
statusdict begin PS3fonts end
<</UseOldfonts false>> setsystemparams
Backward compatibility:
statusdict begin PS2fonts end
<</UseOldfonts true>> setsystemparams
With the appropriate printer driver installed and selected, your software program
enumerates and selects the available PostScript fonts.
4-14
Use ...
Version 7.2 or later of LEXPSNT
Version 1.8 or later of LEXPSNT
Version 4.32 or later of LEXPS
Version 4.02 or later of LEXPS
(temporary, changes the PostScript job only)
(permanent, changes the default in NVRAM)
(temporary, changes the PostScript job only)
(permanent, changes the default in NVRAM)
PostScript