HP 4 FAMILY - Manual (Page 71)

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 accomodate 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).
Printer-Specific Differences 2-35