HP PCL/PJL reference - PCL 5 Comparison Guide

2-34 Printer-Specific Differences ENWW
Vertical substitution characters are those characters which change
their appearance, orientation, or positioning when written vertically.
Examples in Japanese fonts include parentheses, brackets,
punctuation and small kana. In the example above, the two small
characters are replaced with vertical substitutes. Vertical substitution
characters are accessed through the Vertical Substitutes Character
Segment, which is described in more detail later in this chapter.
Font Header Format 16
The HP LaserJet 4PJ printer provides support for large fonts. Large
fonts, such as the MS Mincho and MS Gothic fonts supplied in the
printer, are fonts which are bound to large symbol sets. The
LaserJet 4PJ printer supports a new font header to accommodate
large bound fonts. New segments are provided for support of vertical
substitutes, galley characters, typeface strings, and character
enhancements.
The Font Header Command, described beginning on page 11-6 of the
PCL 5 Printer Language Technical Reference Manual, has several
different header formats. The support of large fonts adds Font Header
Format 16 (Universal Font Header). Font Header Format 16 is
identical in structure to format 15 (Universal Scalable Font Header)
except that the size field for data segments has been enlarged from
16 bits to 32 bits, and a new Font Type has been added for large fonts
(Font Type 3).