HP PCL/PJL reference (PCL 5 Printer Language) - Technical Reference Manual Part I

7-8 Fonts EN
Orientation
Orientation defines the position of the logical page with respect to the
physical page as shown in Figure 7-10.
Figure 7-10 Orientation
The HP LaserJet IID, IIP, 2000, and all PCL 5 LaserJet printers
automatically rotate fonts to the current orientation (all fonts are
available in all four orientations). (Earlier printers required fonts in
the orientation which matched the orientation of the page. Thus,
orientation is not as important as it once was.)
The orientation of a font is still a consideration when the amount of
user memory (RAM) is a concern. Internal and other ROM-based
fonts consume very little user memory. On some printers,
downloaded fonts, scaled fonts, and rotated fonts are stored entirely
in RAM. For bitmap fonts, selecting a font with the current logical
page orientation saves RAM space on some printers.