I/O
Port in Computer
Port
is a connecting socket, outside the system into which different types of cables
are plugged. It is a specific place from which other devices can be physically
connected. I/O ports are the interfaces through which computers communicate
with external devices such as printers, modems, joysticks and terminals. There
are many types of ports used in computer system. Some of them are given as
follows.
1. Parallel Port
Parallel Port
Various peripherals can be connected through parallel port, which is a parallel
communication physical interface. A parallel port transmits 8 bits of a byte of
data in parallel. It is used for transmitting fast data over short distances.
It is used to connect a printer to a computer. Since a parallel port transmits
an entire byte at a time, it operates I/O devices at a relatively high speed. A
Parallel port is primarily used to connect printers to a computer and hence it
is often called a printer port.
2.
Serial Port
Serial port
transmits one bit of a byte, one at a time as a single stream of bits. It is
meant for transmitting slow data over long distances. Communication over a
phone is an example of serial communication. It is a serial communication
physical interface which transmits one bit at a time. Dial-up modems and serial
mice use serial ports.
3.
Universal Serial Bus (USB)
A USB Port can connect up to 127 peripheral devices such as a digital camera, digital speakers, scanners, speakers etc. It permits Plug and Play – configuring of expansion cards and peripheral devices as and when they are installed.
4. Small Computer System Interface (SCSI) Port
SCSI-Small Computer System Interface Port allows data to be transmitted in a daisy chain to up to 7 devices at a speed higher (32 bits at a time) than those possible with serial and parallel ports. It is a fast data transmitting device and is used to connect HDD, CD ROM drives and scanners with the computer system.
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