The LaserJet III introduced the PCL 5 printing language with enhanced page formatting features. PCL 5 is a superset of PCL 4, which is built into other LaserJets. It provides the LaserJet III with much of the functionality of PostScript without the cost and processor overhead.
All older PCL 4 applications should print perfectly with PCL 5. HP also integrated its industry standard HP-GL/2 pen plotter language into PCL 5. HP-GL/2 allows graphics to be described very efficiently and many CAD applications require it.
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