Marlene Galea

Give 1 advantage of computerising a system

Give 1 advantage of computerising a system

Computers are more consistent and reliable than humans

Computers can process and store vast amounts of data very fast

Give1 type of volatile memory besides RAM

Give1 type of volatile memory besides RAM

Cache Memory

Computers deal with data

A defrag utility rids our system of viruses

Computers are better suited than humans at jobs requiring creativity

MS Windows is a GUI

CLI is less user-friendly

The Internet gives an infrastructure for the WWW

Computers deal with data (T)

A defrag utility rids our system of viruses (F)

Computers are better suited than humans at jobs requiring creativity (F)

MS Windows is a GUI (T)

CLI is less user-friendly than GUI (T)

The Internet gives an infrastructure for the WWW (T)

People with visual impairment

CAD

Correcting multiple choice exam papers

Processing Bank cheques

People with visual impairment

Braille Keyboard

CAD

Graphics tablet

Correcting multiple choice exam papers

OMR

Processing Bank cheques

MICR

Name a vector device

Name a raster device

A screen has a resolution of 1024 x 768. How many pixels

does the screen have in all?

If the screen uses 8-bit representation. What is its colour depth?

How many bits are needed to draw this screen once?

What do you understand by ‘refresh rate’?

Name a vector device Plotter

Name a raster device Screen, Inkjet Printer, Laser Printer, Dot Matrix Printer

A screen has a resolution of 1024 x 768. How many pixels does the

screen have in all? 1024 x 768

If the screen uses 8-bit representation. What is its colour depth? 28 = 256

How many bits are needed to draw this screen once? 1024 x 768 x 8

What do you understand by ‘refresh rate’? The number of times the screen is drawn per second

Bin Dec Hex

11011

35

2D

A double-sided disk has 10 tracks, each having 12 sectors. A sector can contain 100 bytes. ◦ How many sectors are there on the disk,

assuming it is double sided?

◦ How many records each 30bytes can fit in a sector? (whole records only)

◦ How much wasted space would there be on the disk?

◦ How many sectors are there on the disk, assuming it is double sided?

◦ 10 x 12 = 120 sectors

◦ How many records each 30bytes can fit in a sector? (whole records only)

◦ 100/3 = 3 records

◦ How much wasted space would there be on the disk?

◦ 100 – (30 x 3) = 10 bytes wasted per sector

◦ 120 x 10 = 1200 total bytes wasted

X

Y

M

N

X

Y

M

N

A B X Y M N C

0 0 1 1 0 0 0

0 1 0 1 0 1 1

1 0 1 0 1 0 1

1 1 0 0 0 0 0

Application software used to locate and display web pages

Application software used to create and edit documents

Application software used for handling and displaying statistical information and datasheets

Application software used to locate and display web pages – Web Browser

Application software used to create and edit documents - Wordprocessor

Application software used for handling and displaying statistical information and datasheets - Spreadsheet

1 magnetic storage device

1 electronic storage device

1 volatile storage device

1 storage device which only allows serial access

1 magnetic storage device

Floppy disk, hard disk, magnetic tape

1 electronic storage device

RAM, ROM

1 volatile storage device

RAM, Cache Memory

1 storage device which only allows serial access

Magnetic Tape

MIPS

DPI

OMR

CPU

MB

MIPS – Millions of Instructions per Second

DPI – Dots Per Inch

OMR – Optical Mark Reader

CPU – Central Processing Unit

MB - Megabyte

Suggest a record structure for the Student File

Suggest a record structure for the Student File

Field Name Field type

Student ID Autonumber

Name Text

Surname Text

etc

Dot matrix printer

Laser printer

Ink jet printer

Plotter

Graphics tablet

Dot matrix printer – printing of bills

Laser printer – printing of documents in a

networked office

Ink jet printer – printing of user documents in

a home

Plotter – printing of maps

Graphics tablet - CAD

OMR

MICR

OCR

Barcode reader

Image scanner

OMR – correction of multiple choice exams

MICR – processing of bank cheques

OCR – digitising of business papers (eg in an insurance agency)

Barcode reader – bill production at a POS

Image scanner – digitising images for online publication

Database

Record

File

Field

Field

Record

File

Database

a. Holds a single data item of a

specified type

b. Is a collection of data items

referring to a particular object

c. Uniquely identifies a record

d. A collection of organised data

structured in such a way that

link between the data allows

for easy access to the data

1. Record

2. Database

3. Keyfield

4. Field

a. Holds a single data item of a

specified type

b. Is a collection of data items

referring to a particular object

c. Uniquely identifies a record

d. A collection of organised data

structured in such a way that

links between the data allow

for easy access to the data

1. Record

2. Database

3. Keyfield

4. Field

1. Raster Device

2. CD-R

3. Vector Device

4. Floppy Disk

5. Hardcopy

6. Softcopy

a. Tangible

b. Pen Plotter

c. 1.44MB

d. Temporary, not tangible

e. Dot matrix printer

f. 650MB

1. Raster Device

2. CD-R

3. Vector Device

4. Floppy Disk

5. Hardcopy

6. Softcopy

a. Tangible

b. Pen Plotter

c. 1.44MB

d. Temporary, not tangible

e. Dot matrix printer

f. 650MB

3 algorithm constructs

3 ways of representing an algorithm

3 algorithm constructs

Sequence – a number of instructions executed in

succession

Decision – a branching instruction

Loop – a number of instructions that are executed

repeatedly usually until a certain condition is met.

3 ways of representing an algorithm

Flowchart, pseudocode, structure diagram

Textual method of representing algorithms

Diagrammatic method of representing algorithms

Area of memory used to hold data temporarily in order to copy items between applications or locations

Textual method of representing algorithms

flowchart

Diagrammatic method of representing algorithms

Pseudocode

Area of memory used to hold data temporarily in order to copy items between applications or locations

Clipboard

1. Decision

2. Terminator

3. Input/output

4. Process

5. connector

1. Decision

2. Terminator

3. Input/output

4. Process

5. connector

Process Input

output

Terminator

Decision

A small hardware item that is capable of decision making

Gives the expected output for all possible combinations of inputs of a logic gate or logic circuit

An inverter gate

A number system that acts as a shorthand way of representing binary numbers

A small hardware item that is capable of decision making – Logic Gate

Gives the expected output for all possible combinations of inputs of a logic gate or logic circuit – truth table

An inverter gate – not gate

A number system that acts as a shorthand way of representing binary numbers - Hexadecimal

Draw a flowchart for an algorithm that asks the user for 2 numbers and then outputs their average

Draw a flowchart for an algorithm that asks the user for 5 numbers, then outputs their average. Use a loop.