HP 4 FAMILY - Manual (Page 89)

Note HP-GL/2 as implemented in HP LaserJet printers has no
mechanism for parsing 2-byte characters. Therefore,
HP-GL/2 character transformations (e.g. SI and SR
commands) cannot be applied to these characters.
Vertical Writing
Vertical writing can be accomplished using the vertical
rotated (“-1”) mode of the Character Text Path command
(?
&c-1T ). When using a vertical rotated text path
direction, full-width characters are rotated and printed “on
their sides.” All other characters are unaffected and the
CAP is still advanced in the horizontal direction. The “-1”
mode has the effect of transforming a portrait page with
horizontal full-width characters into a landscape page with
vertical full-width characters. This can be combined with
the Print Direction command (?
&a#P ) to achieve the
desired text orientation (e.g. portrait, landscape, reverse
portrait, or reverse landscape).
An example of horizontal and vertical rotated writing is
shown below. The first line of text is horizontal writing and
the second line is vertical rotated writing. Note that the “~”
character is replaced with a vertical substitute on the
second line. The C program that follows was used to
generate the PCL commands for this example.
Printer-Specific Differences 2-53