HP PCL 5 Comparison Manual page 45

JOB
JOB renames the current job name.
?&b#WJOB<sp>jobname
All characters are valid. For the job name the first 127
characters are used.
There is no default jobname.
TYPE
TYPE changes the type (device type) portion of the printer's
AppleTalk Name Binding Protocol type field.
?&b#WTYPE<sp>devicetype
Valid characters for the device type include 0-255 except for
characters $00, "@" ($40), ":" ($3A), "*" ($2A), "=" ($3D), and
$C5. The devicetype must contain at least one character,
and only the first 31 characters are used. If an invalid
character ($00 is not treated as an invalid character) is
contained in the devicetype, the printer will ignore the
escape sequence. If the printer encounters the NULL ($00)
character in the devicetype, it uses the NULL character to
terminate the device type. All the characters preceding the
NULL will be used as the devicetype. If the device type is
invalid then the printer's type is not changed.
The default device type for PCL is "HP LaserJet 4" and for
PostScript is "LaserWriter".
Printer-Specific Differences 2-9