PostScript Cartridge for LaserJet IIP, IID, III, IIID, etc. The sharing of an identical Canon engine in two competing products continued with the HP LaserJet II/III and the Apple LaserWriter II, which both used the Canon LBP-SX print engine. The use of a less-ambitious and simpler Page description language allowed HP to deliver its LaserJet to the market about a year before Apple's CX based product, and for $1000 less. HP chose to use their in-house developed Printer Command Language (PCL) as opposed to Apple, which adopted the PostScript language, as developed by Adobe Systems. The first HP LaserJet and the first Apple LaserWriter used the same print engine, the Canon CX engine.

In spring of 1989 The New York Times said that HP 'dominates' the PC laser printer market. Due to a very tight turnaround schedule on the first HP LaserJet, HP elected to use the controller already developed by Canon for the CX engine in the first HP LaserJet. Most HP LaserJet printers employ xerographic laser-marking engines sourced from the Japanese company Canon.

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