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2. RS-232 - Wikipedia

   en.wikipedia.org/wiki/RS-232

   Male pinout of a 25-pin serial port (D-subminiature, DB-25) commonly found on 1980s computers. The following table lists commonly used RS-232 signals (called "circuits" in the specifications) and their pin assignments on the recommended DB-25 connectors [14] (see Serial port pinouts for other commonly used connectors not defined by the standard).

3. Gender changer - Wikipedia

   en.wikipedia.org/wiki/Gender_changer

   An example is a cable connector shell with either two female or two male connectors on it (male-to-male or female-to-female), used to correct the mismatches that result when interconnecting two devices or cables with the same gender of connector. Gender changers are used for RS-232C ports in either the original DB-25 or the IBM AT DE-9 format.

4. Serial port - Wikipedia

   en.wikipedia.org/wiki/Serial_port

   A male D-subminiature connector used for an RS-232 serial port on an IBM PC ... for instance, most serial printers have a female DB25 ... standard was the 25-pin D ...

5. D-subminiature - Wikipedia

   en.wikipedia.org/wiki/D-subminiature

   The above naming pattern was not always followed. Because personal computers first used DB-25 connectors for their serial and parallel ports, when the PC serial port began to use 9-pin connectors, they were often labeled as DB-9 instead of DE-9 connectors, due to an ignorance of the fact that B represented a shell size. It is now common to see ...

6. Gender of connectors and fasteners - Wikipedia

   en.wikipedia.org/wiki/Gender_of_connectors_and...

   A3F = Audio 3-pin female connector; A3M = Audio 3-pin male connector. The terms plug, pin, and prong are also often used for "male" connectors, and receptacle, socket, and slot are used for "female" connectors. In many cases these terms are more common than male and female, especially in documentation intended for the non-specialist. These ...

7. SCSI connector - Wikipedia

   en.wikipedia.org/wiki/SCSI_connector

   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 with differential signaling. Furthermore, DB-25s were commonly used for RS-232 serial cables and also ...