HP PCL/PJL reference - PCL 5 Comparison Guide

2-6 Printer-Specific Differences ENWW
Table 2-3. PCL Feature Additions for HP LaserJet 4 (continued)
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.