HP LaserJet printers employ
xerographic laser-marking engines sourced from the Japanese company
Canon. 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.
The first HP LaserJet and the first
LaserWriter used the same print engine, the Canon CX engine.
 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 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.
 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.