GlossariesGCSE GlossariesGCSE Computer Science GlossaryRegister

Register - GCSE Computer Science Definition

Reviewed by: Robert Hampton

Last updated

What is a Register?

In GCSE Computer Science, a register is defined as extremely small, extremely fast memory located in the CPU.

A register holds small amounts of data that are needed immediately by the CPU during the fetch-execute/fetch-decode-execute cycle.

Each register performs a specific task.

Common examples of registers located in the CPU include:

  • Memory address register (MAR)

  • Memory data register (MDR)

  • Accumulator (ACC)

  • Program counter (PC)

Examiner-written GCSE Computer Science revision resources that improve your grades 2x

  • Written by expert teachers and examiners
  • Aligned to exam specifications
  • Everything you need to know, and nothing you don’t
GCSE Computer Science revision resources

Share this article

Robert Hampton

Reviewer: Robert Hampton

Expertise: Computer Science Content Creator

Rob has over 16 years' experience teaching Computer Science and ICT at KS3 & GCSE levels. Rob has demonstrated strong leadership as Head of Department since 2012 and previously supported teacher development as a Specialist Leader of Education, empowering departments to excel in Computer Science. Beyond his tech expertise, Robert embraces the virtual world as an avid gamer, conquering digital battlefields when he's not coding.

The examiner written revision resources that improve your grades 2x.

Join now