EXERCISE page 9 computers

Answer the following questions avout the passage.

-What makes up a computer system?
The central process unit, that is divided in three parts; the control unit, the arithmetical and logic unit, and the principal memory.

-How does the Arithmetic and Logic Unit Work?
Receive command pulses by the Control unit.

-What are the differences between main memory and back-up storage?
The main memory, stores both the data being processed and the program that controls the processing, and the memory of back up storage

-Can you give some examples of back-up storage?
For example the security copies that you can put on cd´s, diskettes, etc.

-What does a front-end processor do?
It controls the flow of data between the C.P.U and fetched only when required.

-What are the different elements that surround a CPU?
Are peripheral units.

-What are I/O devices? Are the types of peripheral units
Can you give some examples? In devices are fir example keyboards, light pens, microphones… Out devices are monitors, printers… In and out devices are disc drives.

-What do the terms ``on line´´ and ``of line´´ refer to?
Work on line is when you are doing something connected to the internet, and of line is when you are not connected to it.

-What does ``data acquisition´´ mean?
Consist of editing raw data so that it can be fed into a computer in a form the computer can recognise.

-How is data outputted?
It can be outputted printing it on a screen or in a paper whit a printer.

-What is a mainframe system protected against, and why?
Is protected against the fluctuations in the voltage from the main supply, because that can be dangerous for the system.

-What else should an efficient system have?
An air conditioning system and a protection for dust.