Instructions

46 Computer Science Topics

We’ve created 46 modules covering every Computer Science topic needed for GCSE level. These are transferable across AQA, CIE, Edexcel, CIE & Internationally. Suitable for teachers or home educators alike.

Whether you’re a brand new Computer Science teacher, or you’ve been teaching ICT for years, our resources will save you hours and hours of lesson preparation every single week.

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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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