A supermarket uses several different input devices to collect data from staff and customers. Describe in detail THREE input devices which might be in use in a supermarket. For EACH device state: • The purpose of the device • The user (customer, staff

A supermarket uses several different input devices to collect data from staff and customers. Describe in detail THREE input devices which might be in use in a supermarket. For EACH device state: • The purpose of the device • The user (customer, staff

HARDWARE & OPERATING SYSTEMS

 

Instructions to candidates:

 

a) Time allowed: Three hours (plus an extra ten minutes’ reading time at the start – do not write anything during this time)

b) Answer any FIVE questions

c) All questions carry equal marks. Marks for each question are shown in [ ]

d) Mark allocation should determine the length of your answer and the time you spend on it. Generally, one mark is awarded for each valid point

e) Ensure that you pay particular attention to words underlined, in CAPITALS or in bold. FEW OR NO

MARKS will be awarded to any question where these are ignored

f) Use RTL (Register Transfer Language) to define actions in questions related to Fetch-Execute cycle or assembly language programming

g) Read all sections of any question before attempting any part of it

h) No computer equipment, books or notes may be used in this examination

 

1. a) A supermarket uses several different input devices to collect data from staff and customers.

Describe in detail THREE input devices which might be in use in a supermarket.

For EACH device state:

• The purpose of the device

• The user (customer, staff or both)

• The form which the data take

• How the device reads the data [5 each]

b) Explain in detail the purpose of double buffering and how it operates. [5]

 

2. a) The manager of a busy office wishes to buy a printer and asks for your advice. The office prints a lot of large documents and would like to occasionally print in colour. They are considering buying either an inkjet printer or a laser printer. Write a report describing the functionality of EACH of these two types of printer. Highlight the advantages and disadvantages that each type will offer. [10]

b) The use of assistive technology is important in enabling disabled users to access computers.

Name TWO assistive technology devices (input or output) which enable physically disabled users to use a computer. For EACH device explain:

• the purpose of the device

• how the device works, referring to any hardware or software elements

• any issues which may arise in implementing the device [10]

3. a) For EACH of the data structures STACK and QUEUE:

i. explain the purpose of the data structure, giving ONE possible use of EACH data structure

ii. list the basic operations which can be performed on EACH data structure

iii. Describe how EACH data structure might be stored in a computer [10]

b) Write a pseudo-code algorithm to insert an element at the front of a linked list. [10]

Continued


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