OCR GCE A LEVEL 2022 COMPUTER SCIENCE QUESTION PAPER H446-1 PAPER 1-H446/01 Computer Systems
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Course
COMPUTER SCIENCE
Institution
COMPUTER SCIENCE
Answer all questions.
1 A charity uses a desktop computer to record financial donations that it receives. The computer
contains a single core, 2.4GHz processor with 2MB cache.
(a) The processor uses the Von Neumann architecture.
(i) Describe what is meant by the term ‘Von Neumann architectur...
Monday 13 June 2022 – Afternoon
A Level Computer Science
H446/01 Computer Systems
Time allowed: 2 hours 30 minutes
You can use:
• an HB pencil
Do not use:
• a calculator
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
INFORMATION
• The total mark for this paper is 140.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 32 pages.
ADVICE
• Read each question carefully before you start your answer.
1 A charity uses a desktop computer to record financial donations that it receives. The computer
contains a single core, 2.4GHz processor with 2MB cache.
(a) The processor uses the Von Neumann architecture.
(i) Describe what is meant by the term ‘Von Neumann architecture’.
, 4
(c) Fig. 1 shows assembly code written using the Little Man Computer (LMC). The program
calculates and outputs the total amount that is donated to the charity in any particular day.
Depending on the amount, an additional bonus may be added to each amount donated.
start INP
STA donation
SUB hundred
BRP bonus
nobonus LDA total
ADD donation
STA total
OUT
BRA start
bonus LDA total
ADD donation
ADD twenty
STA total
OUT
BRA start
hundred DAT 100
twenty DAT 20
donation DAT 0
total DAT 0
Fig. 1
(i) The program shown in Fig. 1 is run once using three different inputs. Therefore, while
the program is running once, it will output the updated total three times.
Give the total values that are output when the values 10, 50 and 120 are input into this
program.
Output for 10 .....................................................................................................................
Output for 50 .....................................................................................................................
Output for 120 ...................................................................................................................
[3]
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