Duplex printing is a feature of computerprinters that allows the automatic printing of a sheet of paper on both sides. Most printers can only print on a single side of paper ('simplex') automatically. Duplex printers work by using a special Reversing Automatic Document Feeder (RADF), or a duplexing unit that reverses a piece of paper after the first side has been printed. This works in combination with a software solution on the computer that is printing to allow printing on both sides of the paper. Duplex printing is normally built-in to special double-sided printers; however some printers, e.g. the HP LaserJet 4, can be upgraded later on to duplex capability. A Lego RCX Computer is an example of an embedded computer used to control mechanical devices. ... This article or section does not cite its references or sources. ... In Multifunction or all-in-one printers, Automatic Document Feeder, or ADF is a feature which takes several pages and feeds the paper one page at a time into the scanner, allowing the user to scan (and thereby copy, print, or fax) multiple-page documents without having to manually replace... The HP LaserJet 4 (abbreviated sometimes to LJ4 or HP4) is a group of monochrome laser printers produced in the early to mid-1990s as part of the LaserJet series by Hewlett Packard (HP). ...
Duplex Printing on Simplex Printers Simplex Printers can still print duplex jobs, However the user has to manually turn the print job over; and re-initialize the printing of the document.
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