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2. Parallel port - Wikipedia

   en.wikipedia.org/wiki/Parallel_port

   In computing, a parallel port is a type of interface found on early computers ... Pin 25 on the DB25 connector might not be connected to ground on modern computers.

3. IEEE 1284 - Wikipedia

   en.wikipedia.org/wiki/IEEE_1284

   An IEEE 1284 36-pin male micro ribbon printer cable connection. The computer side normally uses a DB-25 port instead of this connector. IEEE 1284, also known as the Centronics port, is a standard that defines bi-directional parallel communications between computers and other devices.

4. 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 ...

5. RS-232 - Wikipedia

   en.wikipedia.org/wiki/RS-232

   Presence of a 25-pin D-sub connector does not necessarily indicate an RS-232-C compliant interface. 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 ...

6. Parallel SCSI - Wikipedia

   en.wikipedia.org/wiki/Parallel_SCSI

   Amphenol-50 SCSI plug 68-pin twisted ribbon cable used for LVD SCSI connections. Parallel SCSI (formally, SCSI Parallel Interface, or SPI) is the earliest of the interface implementations in the SCSI family. SPI is a parallel bus; there is one set of electrical connections stretching from one end of the SCSI bus to the other. A SCSI device ...

7. 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 ...