, ,
Cambridge International AS & A Level
…
● Answer all questions.
● Use a black or dark blue pen.
● Write your name, centre number and candidate number in the boxes at the top of the page.
● Write your answer to each question in the space provided.
● Do not use an erasable pen or correction fluid.
● Do not write on any bar codes.
● You may use an HB pencil for any diagrams, graphs or rough working.
● Calculators must not be used in this paper.
INFORMATION
● The total mark for this paper is 75.
● The number of marks for each question or part question is shown in brackets [ ].
● No marks will be awarded for using brand names of software packages or hardware.
, 2
This document has 16 pages. Any blank pages are indicated.
DC (WW/CB) 337421/2 © UCLES 2025 [Turn over
, ,
1 (a) Complete the truth table for the logic expression:
X = (A XOR B) NAND (A AND (B XOR C))
Working space
A B C X
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
[2]
(b) Draw the logic circuit for the logic expression:
© UCLES 2025 9618/12/O/N/25
, 3
, ,
2 Embedded systems are used in many electronic devices.
(a) Describe the drawbacks of embedded systems.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................. [3]
(b) An embedded system has Dynamic RAM (DRAM).
Identify one benefit of using DRAM instead of Static RAM (SRAM) in an embedded system.
...................................................................................................................................................
............................................................................................................................................. [1]
(c) Give two differences between Erasable Programmable ROM (EPROM) and Electrically Erasable
Programmable ROM (EEPROM).
Difference 1 ..............................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
Difference 2 ..............................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
[2]
© UCLES 2025 9618/12/O/N/25 [Turn over
Cambridge International AS & A Level
…
● Answer all questions.
● Use a black or dark blue pen.
● Write your name, centre number and candidate number in the boxes at the top of the page.
● Write your answer to each question in the space provided.
● Do not use an erasable pen or correction fluid.
● Do not write on any bar codes.
● You may use an HB pencil for any diagrams, graphs or rough working.
● Calculators must not be used in this paper.
INFORMATION
● The total mark for this paper is 75.
● The number of marks for each question or part question is shown in brackets [ ].
● No marks will be awarded for using brand names of software packages or hardware.
, 2
This document has 16 pages. Any blank pages are indicated.
DC (WW/CB) 337421/2 © UCLES 2025 [Turn over
, ,
1 (a) Complete the truth table for the logic expression:
X = (A XOR B) NAND (A AND (B XOR C))
Working space
A B C X
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
[2]
(b) Draw the logic circuit for the logic expression:
© UCLES 2025 9618/12/O/N/25
, 3
, ,
2 Embedded systems are used in many electronic devices.
(a) Describe the drawbacks of embedded systems.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................. [3]
(b) An embedded system has Dynamic RAM (DRAM).
Identify one benefit of using DRAM instead of Static RAM (SRAM) in an embedded system.
...................................................................................................................................................
............................................................................................................................................. [1]
(c) Give two differences between Erasable Programmable ROM (EPROM) and Electrically Erasable
Programmable ROM (EEPROM).
Difference 1 ..............................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
Difference 2 ..............................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
[2]
© UCLES 2025 9618/12/O/N/25 [Turn over
