Apple LaserWriter 12/640 PS - Manual (Page 235)

Additional printer options
In addition to the Paper tab, other tabs display settings for:
m PostScript
m Fonts
m Features
m Job control
m Watermark
PostScript
Click the PostScript tab to display the PostScript tab dialog box, which
controls color printing, the communication protocol, and PostScript Level 2
features.
m Use PostScript Level 2 features Tells the driver to use PostScript Level 2
features when printing documents. Use the Level 2 features to speed
printing.
210 Chapter 7