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2. Serial port - Wikipedia

   en.wikipedia.org/wiki/Serial_port

   The IBM PC implements its serial ports, when present, with one or more UARTs. Very low-cost systems, such as some early home computers, would instead use the CPU to send the data through an output pin, using the bit banging technique. These early home computers often had proprietary serial ports with pinouts and voltage levels incompatible with ...

3. Rollover cable - Wikipedia

   en.wikipedia.org/wiki/Rollover_cable

   This cable is typically flat (and has a light blue color) to help distinguish it from other types of network cabling. It gets the name rollover because the pinouts on one end are reversed from the other, as if the flat cable had been rolled over. This cabling system was invented to eliminate the differences in RS-232 wiring systems. Any two RS ...

4. 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).

5. List of video connectors - Wikipedia

   en.wikipedia.org/wiki/List_of_video_connectors

   The signal standard and pinout are backward-compatible with CGA, allowing EGA monitors to be used on CGA cards and vice versa. Early VGA cards also used this connector. VGA connector (DE-15) Became a nearly ubiquitous analog computer display connector after first being introduced with IBM x86 machines. Older VGA connectors were DE-9 (9-pin).

6. Serial cable - Wikipedia

   en.wikipedia.org/wiki/Serial_cable

   Serial cables are typically used for RS-232 communication. A serial cable or RS-232 cable is a cable used to transfer information between two devices using a serial communication protocol. The form of connectors depends on the particular serial port used. A cable wired for connecting two DTEs directly is known as a null modem cable.

7. D-subminiature - Wikipedia

   en.wikipedia.org/wiki/D-subminiature

   Comprehensive DB-25 wiring diagrams: Tascam, Apple, SCSI, etc. "Pinouts by Connector". Pinouts. A list of common computer connectors, including most D-sub. "9 pin D-SUB female connector diagram and applications". Pinouts. Archived from the original on 2007-09-01 Devices with DE-9 connectors. "D-sub 9 Connector Pinout".

8. Modified Modular Jack - Wikipedia

   en.wikipedia.org/wiki/Modified_Modular_Jack

   The Modified Modular Jack (MMJ) is a small form-factor serial port connector developed by Digital Equipment Corporation (DEC). It uses a modified version of the 6P6C modular connector with the latch displaced off-center so standard modular connectors found on Ethernet cables or phone jacks cannot accidentally be plugged in. MMJ connections are used on Digital minicomputers, such as the PDP-11 ...

9. DB9 - Wikipedia

   en.wikipedia.org/wiki/DB9

   DB9 (yacht), a superyacht built by Palmer Johnson in 2010 DE-9 connector , a common type of D-subminiature electrical connector, widely referred to as "DB-9" even though that is a different sized connector.