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There are many types of parallel ports, but the term has become most closely associated with the printer port or Centronics port found on most personal computers from the 1970s through the 2000s. It was an industry de facto standard for many years, and was finally standardized as IEEE 1284 in the late 1990s, which defined the Enhanced Parallel ...
An IEEE 1284 36-pin female on a circuit board. In the 1970s, Centronics developed the now-familiar printer parallel port that soon became a de facto standard.Centronics had introduced the first successful low-cost seven-wire print head [citation needed], which used a series of solenoids to pull the individual metal pins to strike a ribbon and the paper.
This size, with 36 pins and bail locks, is also known as a Centronics connector because of its introduction by Centronics for use with the parallel port of printers, and is standardized as IEEE 1284 type B. Other connectors of this size are also called Centronics connectors. The smaller size has 0.050 inch (1.27 mm) pitch.
Centronics Data Computer Corporation was an American manufacturer of computer printers, now remembered primarily for the parallel interface that bears its name, the Centronics connector. History [ edit ]
Centronics can mean: Centronics, a printer company that developed the parallel port standard; IEEE 1284, the parallel interface standard that superseded the Centronics interface; Micro ribbon connectors, used by Centronics for their parallel port and often known as Centronics connectors
SCSI-1 card with an external Centronics port which requires a terminator, from an Acorn computer. Old Macintosh DB-25 SCSI port (narrow) Apple used DB-25 connectors, which, having only 25 pins rather than 50, were smaller and less expensive to make, but decreased signal integrity (increasing crosstalk ) [ citation needed ] and cannot be used ...
On PCs, 25-pin and (beginning with the IBM PC/AT) 9-pin plugs were used for the RS-232 serial ports; 25-pin sockets were used for parallel ports (instead of the Centronics port found on the printer itself, which was inconveniently large for direct placement on the expansion cards).
For example, on the original IBM PC, a male D-sub was an RS-232-C DTE port (with a non-standard current loop interface on reserved pins), but the female D-sub connector on the same PC model was used for the parallel "Centronics" printer port. Some personal computers put non-standard voltages or signals on some pins of their serial ports.