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The original IBM parallel printer adapter for the IBM PC of 1981 was designed to support limited bidirectionality, with 8 lines of data output and 4 lines of data input. [ citation needed ] This allowed the port to be used for other purposes, not just output to a printer.
A Direct Cable Connection dialog box on Windows 95. Direct Cable Connection (DCC) is a feature of Microsoft Windows that allows a computer to transfer and share files (or connected printers) with another computer, via a connection using either the serial port, parallel port or the infrared port of each computer.
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.
The Centronics Model 101 was introduced at the 1970 National Computer Conference in May. The print head used an innovative seven-wire solenoid impact system. Based on this design, Centronics later developed the first dot matrix impact printer (while the first such printer was the OKI Wiredot in 1968).
A null modem adapter. Null modem is a communication method to directly connect two DTEs (computer, terminal, printer, etc.) using an RS-232 serial cable.The name stems from the historical use of RS-232 cables to connect two teleprinter devices or two modems in order to communicate with one another; null modem communication refers to using a crossed-over RS-232 cable to connect the teleprinters ...
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).
Printer cable refers to the cable that carries data between a computer and a printer. There are many different types of cables, for example: Serial: RS-232, EIA-422; Parallel; FireWire; USB; Parallel port printers have been slowly phased out, and are now difficult to find for the most part, being considered as an obsolete legacy port on most ...