HP introduced their version of bidirectional, known as Bitronics, on the LaserJet 4 in 1992. IBM implemented an early form of bidirectional interface in in 1987. Vendors soon released printers compatible with both standard Centronics and the IBM implementation. IBM standardized the parallel cable with a DB25F connector on the PC side and the Centronics connector on the printer side. IBM released the IBM Personal Computer in 1981 and included a variant of the Centronics interface- only IBM logo printers (rebranded from Epson) could be used with the IBM PC. The Dataproducts interface was found on many mainframe systems up through the 1990s, and many printer manufacturers offered the Dataproducts interface as an option. Dataproducts parallel was available in a short-line for connections up to 50 feet (15 m) and a long-line version for connections from 50 feet (15 m) to 500 feet (150 m). It used a DC-37 connector on the host side and a 50 pin connector on the printer side-either a DD-50 (sometimes incorrectly referred to as a "DB50") or the block shaped M-50 connector the M-50 was also referred to as Winchester. For example, early VAX systems used a DC-37 connector, NCR used the 36-pin micro ribbon connector, Texas Instruments used a 25-pin card edge connector and Data General used a 50-pin micro ribbon connector.ĭataproducts introduced a very different implementation of the parallel interface for their printers. The Centronics parallel interface quickly became a de facto industry standard manufacturers of the time tended to use various connectors on the system side, so a variety of cables were required. The now-familiar connector was selected because Wang had a surplus stock of 20,000 Amphenol 36-pin micro ribbon connectors that were originally used for one of their early calculators. An Wang, Robert Howard and Prentice Robinson at Wang Laboratories. The Centronics Model 101 printer was introduced in 1970 and included the first parallel interface for printers. The IEEE 1284 standard defines the bi-directional version of the port.
It is also known as a printer port or Centronics port. A parallel port is a type of interface found on computers (personal and otherwise) for connecting various peripherals.
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