HP Deskjet Support, Comments, Feature/Command, Table 2-3.PCL Feature Additions for HP LaserJet 4 (continued)

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.

2-6 Printer-Specific Differences