Peripherals agus Cuimhne

### Compter Peripherals and Memory

A CPU is not a peripheral device.
A keyboard, monitor, and mouse are peripheral devices..
A port allows transfer of data between a variety of devices and computer.
ROM (Read-Only Memory) is computer memory where the user cannot write new information or instructions.
A byte is a group of 8 bits.
A megabyte is equivalent to 1,024,000 bytes.
Device drivers allow peripheral devices to communicate with the computer.
The two basic types of memory in a computer are primary and secondary.
A CD is a non-erasable disk that stores digitized audio information.
Outputting is the process of producing useful information for the user.
The output unit converts user input into computer-understandable form.
A scanner is a device to convert printed documents to digital form.
The smallest unit of data in a computer is a bit.
A monitor looks like a television and is normally used with non-portable computer systems. It can be CRT or Flat panel monitors.
Input and Output (I/O) devices are often called peripheral devices because they are in the external part of the computer.
Data is a raw material used as input and processed data becomes information.
Computer has a characteristic of speed, accuracy, and capacity.
Memory is a place where data and information can be stored.
The main memory depends on the size of the address bus.
Secondary memory is independent of the address bus.
MAR stands for Memory Address Register.
Optical disks are a promising random access medium for high capacity secondary storage.
The technology used in optical disks is a laser beam.
The storage capacity of an optical disk is given by the number of sectors multiplied by the number of bytes per sector.
The rotation of a disk must vary inversely with the radius of the disk.
The tracks are divided into sectors whose size remains the same.
The range of access times of optical disks are generally 100 to 300 milliseconds.
DVD uses laser beam technology.
A bar code reader is an input device.
A supercomputer is the most powerful computer.
A kilobyte is 1024 bytes.
Memory management is the process of allocating memory to the program to keep them separate.
A thin client has no hard disk.
Earth stations send and receive satellite signals.
A transponder ensures that outgoing satellite signals do not interfere with incoming signals.
Cellular phones are least susceptible to noise.
Token passing is a method used for network access.
Centralized processing holds all data and processing in one site.
Half-duplex allows data to be sent in both directions but in only one way at a time.
A modem converts digital data to analog and vice-versa.
A network is a group of computers connected together.
A communication network can be wire or wireless.
A web page is identified by a URL.
The last part of the domain name is the top-level domain.
A browser is used to access the internet and display Web pages.
ARPANET was the first major computer network.
The most used top-level domain is .com.
A user can access a company's network using Telnet.
A computer's primary storage is measured in bytes.
An example of a computer's primary storage is RAM.
A microprocessor clock's speed is measured in Hz.
An example of a peripheral device is a printer..
An operating system helps manage computer resources.
A processor (CPU) is an electronic circuitry for executing instructions.
Instructions are also called software.
An instruction set is a set of instructions that a computer can execute.