The HP LaserJet IID, a PCL level 4 language printer, is based on the Canon RX engine. This engine is capable of duplex printing (both sides of the paper), hence II″D″ for Duplex. The LaserJet IID has 14 built-in fonts, which is eight more than the Series II. Most font cartridges for the II are useable in the IID, but emulation cartridges are not. The video interface that comes with the JetScript for the Series II will not work in a IID. The video interfaces that come with LaserMaster controllers and others that access only the video lines will work in the II or the IID. The cover set is the same shape as that of the Canon LBP-8IIR, but the color is a shade lighter.