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Feature/Command Support Comments
Status Readback
New Feature The addition of 6 new status readback commands enable
the user to receive certain information back from the
printer about fonts, symbol sets, macros, user-defined
patterns, and available memory.
Location Type Command
New Used to specify a status readback type of location
(current, all, internal, downloaded, cartridge, SIMMs).
Location Unit Command
New Specifies a status readback location unit (all, temporary
or permanent, highest-lowest priority, specific SIMM).
Inquire Entity Command
New Requests the status from the location (type and unit)
specified for fonts, symbol sets, macros, or user-defined
patterns.
Flush All Pages Command
New Allows the user to clear page data from printer memory.
Free Memory Command
New This command returns the current available memory.
Echo Command
New Allows the user to send a unique ID number to the
printer to be used as a “place holder.”
Bezier Curve Commands
New HP-GL/2 commands (relative and absolute) that allow a
user to draw complex curves with less data required
than that required for arcs.
Label Origin
Modified Label position LO 21 is provided for correct alignment of
HP-GL/2 text with PCL text.
Fill Polygon
Modified Previously, the HP-GL/2 Fill Polygon command filled
polygons using the odd/even fill technique. A second
technique, non-zero winding fill, has been added.
Macros
Modified HP-GL/2 is now supported in macros.
Configuration Command
New Added to allow the user to communicate with the MIO
card in the printer.
Table 2-3. PCL Feature Additions for HP LaserJet 4 (continued)
2-6 Printer-Specific Differences