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2. Registered jack - Wikipedia

   en.wikipedia.org/wiki/Registered_jack

   A cable with a 50-pin connector on one end can support six fully wired 8P8C connectors or Ethernet ports on a patch panel with one spare pair. Alternatively, only the necessary pairs for 10/100 Ethernet can be wired allowing twelve Ethernet ports with a single spare pair. This connector is also used with spring bail locks for SCSI-1 connections.

3. List of video connectors - Wikipedia

   en.wikipedia.org/wiki/List_of_video_connectors

   Proprietary connector used on Apple Macintosh Centris computers, and the Apple AudioVision 14 Display. An attempt by Apple to deal with cable clutter, by combining five separate cables from computer to monitor. Female port (20-pin) Digital Flat Panel (DFP) Used with the PanelLink digital video protocol. Deprecated. Made obsolete by DVI.

4. Parallel port - Wikipedia

   en.wikipedia.org/wiki/Parallel_port

   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. This was accomplished by allowing the data lines to be written to by ...

5. Computer port (hardware) - Wikipedia

   en.wikipedia.org/wiki/Computer_port_(hardware)

   Examples of computer connector sockets on various laptops Ports on the back of the Apple Mac Mini (2005) A computer port is a hardware piece on a computer where an electrical connector can be plugged to link the device to external devices, such as another computer, a peripheral device or network equipment. [1] This is a non-standard term.

6. Printer cable - Wikipedia

   en.wikipedia.org/wiki/Printer_cable

   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 ...

7. IEEE 1284 - Wikipedia

   en.wikipedia.org/wiki/IEEE_1284

   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.