The first LaserJet was a high-speed replacement for text-only daisy wheel impact printers and the noisy dot matrix printers. By using control codes it was possible to change the printed text style using font patterns stored in permanent ROM in the printer. Although unsupported by HP, because the Laserjet used the same basic PCL language (PCL Level III)[8] spoken by HP's other printers it was possible to use the Laserjet on HP 3000 multiuser systems.