 It was very similar to other printers based on the Canon SX engine, such as the Apple LaserWriter II series and HP LaserJet II/III, although those other printers only printed at 300x300 dpi.Some parts (such as the toner cartridge and input paper tray) are interchangeable with the LaserJet II/III.The printer used a proprietary high-speed serial interface, and was in essence a predecessor of the software-rendering approach, as it used the DisplayPostscript renderer in NeXTStep rather than a hardware PostScript renderer.