to execute program instructions and coordinate the activities of all the other units
What is the function of the system clock?
It sends out signals at fixed intervals to measure and synchronize the flow of data.
What unit of frequency is used to measure processor speed?
gigahertz (GHz)
It produces UPPER CASE letters, but it does not affect numbers and symbols. What key is it?
Caps Lock
It moves the cursor to the beginning of a new line. It is also used to confirm commands. What key is it?
return/enter
What is a computer?
A computer is an electronic machine which can accept data in a certain form, process the data, and give the results of the processing in a specified format.
It moves the cursor horizontally to the right for a fixed number of spaces (in tabulations and data fields).What key is it?
tab
What type of memory is volatile?
RAM (random access memory)
What does ASCII stand for?
Standard Code for Information Interchange
What are three basic hardware sections?
the central processing unit (CPU), main memory and peripherals
What is a bus and bus width?
Electrical channel that allows devices inside the computer to communicate with each other. The size of a bus, called bus width.
What does the CPU stand for?
the central processing unit
What are function keys?
They appear at the top of the keyboard and can be programmed to do special tasks
are used to They issue commands or to produce alternative characters, e.g. the Ctrl key or the Alt key.
What is a mainframe?
A mainframe computer is more powerful than a PC. It is used by large organizations that need to process enormous amounts of data.
What are the main parts of the CPU?
The control unit, the arithmetic logic unit, the registers
What's the difference between hardware and software?
Hardware is any electronic or mechanical part you can see or touch. Software is a set of instructions, called a program, which tells the computer what to do.
It works in combination with other keys. For example, you press this key and C to copy the selected text. What key is it?
Ctrl
What term is used to refer to the main printed circuit board?
the motherboard
They are used to move the cursor, as an alternative to the mouse. What keys are they?
arrow keys
A long key at the bottom of the keyboard. Each time it is pressed, it produces a blank space. What key is it?
space bar
What is a bit and a byte?
Each 1 or is called a binary digit, or bit. Eight bits together are called a byte.
What are cursor control keys?
They include arrow keys that move the insertion point up, down, right and left, and keys such as End, Home, Page Up and Page Down.
It removes the character to the left of the cursor or any selected text. What key is it?
backspace
What is the purpose of ASCII?
Produce a standard code for the binary representation of characters.
What does ALU do?
it performs mathematical calculations (+, -, etc.) and logical operations (AND, OR, NOT)
What does a computer system consist of?
A computer system consists of two parts: hardware and software.
What do peripherals include?
storage devices and input/ output devices
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