O-LevelComputer ScienceProgramming2210/11 · May/June 2020 · Q911 Marks

Programs can be written in a low-level language.

(a)Identify three features of a low-level language. Feature 1 Feature 2 Feature 3[3]
(b)Give two examples of a low-level language. Example 1 Example 2[2]
(c)Give one drawback of writing programs in a low-level language, instead of a high-level language.[1]
(d)(i)Give the 8-bit binary value of the two denary values: 180 201 Working space[2]
(d)(ii)Give the 12-bit binary value of the denary value 250. Working space[1]
(d)(iii)Binary can be represented as hexadecimal to make it easier to read. Give the hexadecimal values of the 8-bit binary values: 10010011 00011101[2]

Mark scheme

Marking points from the official mark scheme (May/June 2020). The mark or mark type is shown in brackets.

[3] 9(a) Any three from: Closer to/is machine code; May use mnemonics; May need an assembler to be translated; One line of code represents a single instruction; Machine dependent; Have direct access to memory locations/registers
[2] 9(b) Assembly code; Machine code
[1] 9(c) Any one from: It is more difficult to understand; Error prone; Have to manipulate memory locations; Machine dependent
[2] 9(d)(i) 10110100; 11001001
[1] 9(d)(ii) 000011111010 (must have leading zeros)
[2] 9(d)(iii) 93; 1D

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