Apple ColorLaserWriter 12/600PS - Manual (Page 309)

Styled fonts
Most fonts that come with your Color LaserWriter 12/600 PS printer have
defined styles. For example, if you open the Bookman font suitcase, you see
files for bold and italic versions of the font.
But fonts such as Chicago, Geneva, Monaco, and New York do not come with
defined styles. If you open the Chicago font (contained in a suitcase in the
Fonts folder, which is inside your System Folder), you see only one file.
You can apply a style to a font like this by making a choice from the
appropriate menu (Fonts, Style, Format, or some similar menu, depending on
the application program). A font predesigned with a given style nearly always
looks better than a font with a computer-generated “derived” style.
About style names: Predesigned styled fonts sometimes have names you may
not be familiar with. For example, roman refers to a font without styling, or
plain. Oblique is similar to italic. Light, demi, and extra are different states
of bold.
287 Using Fonts With the Printer