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Unformatted text preview: y are of two types -serial ports and parallel ports.
35. A serial port may be used to connect any device that can send or receive a stream of
bytes serially, one bit at a time. It is used for connecting slow I/O devices such as
terminal, keyboard, mouse, modem, etc.
36. A. parallel port can handle a higher volume of data than a serial port because it
transfers 8 or 16 bits of data at a time. It is used for connecting faster I/O devices such
as printer, analog-to-digital and digital-to-analog converters, etc.
37. SCSI interface uses a generic device controller (called SCSI controller) and allows
any device with an SCSI interface to be directly connected to the SCSI bus of the SCSI
controller. This helps save expansion slots in a computer for connecting other devices.
38. Depending on their local processing capability, terminals are classified as dumb,
smart and intelligent. A dumb terminal simply has alphanumeric display capability. A
smart terminal has local data editing capability and the ability to consolidate input data
prior to sending them to the main computer. It has a microprocessor and some internal
storage in addition to I/O capabilities. An intelligent terminal is a small computer by
itself that has extensive local data processing power.
It consists of a built-in
microcomputer that can be programmed by users.
39. An X terminal is a graphics terminal that has a rich set of commands to display
characters, move the cursor position, draw graphics and images, and manage multiple
windows on the screen.
40. A terminal emulator is a program that runs on a PC or workstation and pretends that
it is a terminal when the PC or workstation is connected to a network and communicates
with other computers on the network.
41. Privacy filters are used with monitors to prevent others sitting/standing nearby the
monitor from viewing the contents displayed on it.
42. Ergonomically designed I/O devices aim at achieving maximum efficiency of the
users working with them by designing them in such a way...
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This document was uploaded on 04/07/2014.
- Spring '14