What Is the Difference between PCL and Postscript Drivers? - Inkjet Wholesale Blog
HP PCL/PJL Reference - BelHard Service
HP LaserJet Enterprise, HP OfficeJet Enterprise - PCL font supports Bar Code printing when using the HP FutureSmart firmware version 3.7 or newer | HP® Customer Support
Common PCL 5e printer commands - HP LaserJet 4100 Printer series