Bytesize CS

Computer Science revision in bytesize pieces

Topic slides, videos, exam questions and interactive models for OCR Computer Science. Choose your course to get started.

OCR J277

GCSE

  • Paper 1: Computer systems
  • Paper 2: Computational thinking, algorithms and programming
  • Past papers and mark schemes
Go to GCSE revision →
Coming soon

A level

Revision for OCR A level Computer Science (H446) is on its way.

Practice tools

Binary to denary4-bit, 8-bit and two’s complement Denary to binaryClick the bits to build the number Binary additionNibbles and bytes, with carries and overflow Binary shiftsLogical shifts left and right, 1 to 5 places HexadecimalHex, binary and denary, with a step via binary FDE cycle explorerFollow addresses and instructions through the CPU