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A Rainbow Tech parallel port dongle PCB, front side. Note the numbers rubbed off the chips to make reverse engineering harder A Rainbow Tech parallel port dongle PCB, back side. Dongles rapidly evolved into active devices that contained a serial transceiver and even a microprocessor to handle transactions with the host.
The parallel port interface was originally known as the Parallel Printer Adapter on IBM PC-compatible computers. It was primarily designed to operate printers that used IBM's eight-bit extended ASCII character set to print text, but could also be used to adapt other peripherals.
A parallel port adapter. There are varying accounts on the etymology of the word "dongle"; in a 1999 paper, P. B. Schneck stated that the origin was unclear, but that it was possibly a corruption of the word "dangle" (since these devices "dangle" from a port on a PC).
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.
Serial port, parallel port, game port, Apple Desktop Bus, PS/2 port, and FireWire (IEEE 1394) Universal Serial Bus ( USB ) is an industry standard , developed by USB Implementers Forum (USB-IF), that allows data exchange and delivery of power between many types of electronics.
This is an Accton Etherpocket-SP parallel port Ethernet adapter (c. 1990). Supports both coaxial and twisted pair cables. Power is drawn from a PS/2 port passthrough cable. Before the introduction of the PCMCIA card, the parallel port was commonly used for portable peripherals. [6]
Parallel versus serial communication In data transmission , parallel communication is a method of conveying multiple binary digits ( bits ) simultaneously using multiple conductors. This contrasts with serial communication , which conveys only a single bit at a time; this distinction is one way of characterizing a communications link .
SCSI-1 card with an external Centronics port which requires a terminator, from an Acorn computer. 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 ...
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