Issuu on Google+

Program File or Data File? Microsoft Access Downloaded past paper from SQA website

Program file Data File

Image of school badge Adobe Photoshop Profit/Loss spreadsheet Windows XP

Data file Program file Data file Program file


Systems Software or Applications Software? Microsoft Publisher Paint Anti-virus Solitaire Disk defragmenter

Application software System software Application software System software System software

Windows XP System software


Interactive or Real-time? Real-time

Missile Guidance System

Interactive

Withdrawing cash from an ATM

interactive interactive

Library lending system Buying a DVD on Play.com

Real-time

Heat control in a Nuclear Power station

Real-time

Heart monitor in intensive care


Operating System List the 5 functions of the Operating System • Provides the HCI • Controls input and output devices • error reporting • Decides save destinations of files •

Sucks, ubuntu is better


Software Portability Some software is portable. Describe what this means. It means that something can be moved easily and can fit in a pocket or bag and usually has a battery so it can be used without a power supply, for example a mobile phone


Device Drivers Device drivers are • Software • Program files • Systems Software Explain the function of a device driver • To allow the computer to communicate with a device Printing a document runs as a background job on a computer system. What does this mean? • It means that it is not visually visable to the user


Filing systems • Draw an example of a hierarchical filing system

• Draw an example of a flat filing system


Sequential & Random Access Explain how sequential access works • An example is

Explain how random/direct access works • An example is


Central Processing Unit

RAM

ROM

Processor CU

Data Flow

Click and drag the text boxes and arrows to the appropriate position on the diagram above Registers

Input Devices

ALU

Output Devices

Backing Storage Devices


The Processor Describe the function of each of the following: • Control Unit

• Arithmetic & Logic Unit (ALU)

• Registers


Memory Describe two differences between RAM and ROM •


Data Storage Explain how the processor can find data stored in main memory.

What happens to the processor speed if the word length is increased? Explain your answer.


Bits and Bytes What does bit stand for? How many bits are required to store 1 character? Complete the following table: • 1 Byte = ?? bits • 1 KB = ?? bytes • 1 MB = ?? kilobytes • 1 GB = ?? megabytes • 1 TB = ?? gigabytes What does TB stand for? Find out what comes after TB


Representing Text • What does ASCII stand for? • How many bits are required to represent each ASCII code? • What is the 8 bit binary representation for the decimal number 21?


Bit-mapped Graphics

Calculate the size of this bit-mapped image.


Hardware Create three boxes labelled Input Devices, Output Devices and Backing Storage Devices. Drag each of the 20 images to the appropriate box. Can you name each device?


Backing Storage Put the images in the correct boxes. You may have to duplicate some of the images. Magnetic

Optical

Sequential Access

Random/Direct Access


Comparison of Backing Storage Use the internet to find the capacity for each of the following storage media

Media

Speed

Cost

Magnetic Tape

Slow

£20-£100

Floppy disk

Slow

£0.10

Hard disk

Fast

£50 - £1000

CD-ROM

Medium

Depends on Contents

DVD-ROM

Medium

Depends on Contents

CD-R

Medium

£0.25

CD-RW

Medium

£1

DVD-R

Medium

£5

DVD-RW

Medium

£10

Medium/Fast

£10 - £50

USB

Capacity


Computing 1