Instructions

GCSE Computer Science Resources
14-16 Years Old

48 modules covering every Computer Science topic needed for GCSE level, and each module contains:

  • An editable PowerPoint lesson presentation
  • Editable revision handouts
  • A glossary which covers the key terminologies of the module
  • Topic mindmaps for visualising the key concepts
  • Printable flashcards to help students engage active recall and confidence-based repetition
  • A quiz with accompanying answer key to test knowledge and understanding of the module
View the GCSE Resources →

KS3 Computing Resources
11-14 Years Old

We’ve created 45 modules covering every Computer Science topic needed for KS3 level, and each module contains:

  • An editable PowerPoint lesson presentation
  • Editable revision handouts
  • A glossary which covers the key terminologies of the module
  • Topic mindmaps for visualising the key concepts
  • Printable flashcards to help students engage active recall and confidence-based repetition
  • A quiz with accompanying answer key to test knowledge and understanding of the module
View the KS3 Resources →

Candidates should be able to:

  • explain how instructions are coded as bit patterns
  • explain how the computer distinguishes between instructions and data.

How are program instructions coded?

Machine code instructions are binary numbers and are coded as bit patterns, for example, a 16 bit machine code instruction could be coded as 001010101101001011.

In machine code the instructions are usually made up of 2 parts, an operator (op code) and an operand (typically a memory address). The CPU decodes the operator (for example, the bit pattern . . .

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