HP 4 FAMILY - Manual (Page 99)

Font Header
Format 16 Bitmap
Font Support
Font Header Format 16 was introduced with the HP
LaserJet 4PJ for downloading large TrueType fonts. For the
HP LaserJet 4V, Font Header Format 16 has been extended
to support large bitmap fonts as well. The Font Header
command ( ? ) s # W [font header data] ) is used to
download font header data to the printer.
A large font is a bound font with character codes that are
not limited to 8-bit values. For this reason a large font is
sometimes called a 16-bit font.
Font Header Format Font Header Format 16 was introduced because some font
data segments in large fonts could be larger than 65535
bytes, and this was not supported by Font Header Form
at 15. The structures of Format 15 and Format 16 are
identical with the exception of the Segment Size field in the
Segmented Font Data format. Table 2-10 below shows the
Format 15 and Format 16 Font Header format. Table 2-11
shows the Format 15 Segmented Font Data format. Table
2-12 shows the Format 16 Segmented Font Data format.
Note that Format 15 does not support bitmap fonts.
Printer-Specific Differences 2-63