The HP LaserJet II, a PCL level 4 language printer, is based on the Canon RX engine. The HP IId 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.
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