HP 4 FAMILY - Manual (Page 40)

Raster Graphics
Adaptive
Compression (IIIP)
Adaptive compression was added to the PCL language with
the introduction of the HP LaserJet IIIP printer. Adaptive
compression (or method 5 as it is referred to) is a method
for compressing raster data using the raster Set
Compression Method command (parameter value 5). (Refer
to the Set Compression Method command in the PCL 5
Printer Language Technical Reference manual for detailed
information on using this compression technique.) Also,
refer to Chapter 4 in this document, “Raster Graphics
Adaptive Compression (Method 5)” for additional
information.
HP LaserJet 4
Printer
Several new PCL features were added to the PCL 5
language with the release of the HP LaserJet 4 printer.
These new features are summarized in Table 2-3. Most of
these features are described in the revised PCL 5 Printer
Language Technical Reference Manual (part number
5961-0509). (This revised technical reference manual is
supplied as part of the Technical Reference Documentation
Package which can be obtained by ordering part number
5961-0601.) In addition, there are some additional
differences for the HP LaserJet 4 printer that are not
covered in the technical reference manual but are described
below.
Note The HP LaserJet 4M printer, in addition to PCL, contains
PostScript and a LocalTalk I/O for printing in the
Macintosh environment. PCL operation and the PCL
internal fonts for this printer are identical to the HP
LaserJet 4 printer. Thus, for PCL information for the HP
LaserJet 4M printer, refer to the HP LaserJet 4 printer
features.
2-4 Printer-Specific Differences