Home of real teaching & learning
  • Full support for teachers
  • Focus on critical thinking
  • Engaging classroom activities
  • Integrated student eBook
  • Assessed tasks / qBank
  • Practice exam questions

The InThinking Guarantee: Our sites are written by expert practitioners and not by AI

See our AI policy

Disclaimer: InThinking subject sites are neither endorsed by nor connected with the International Baccalaureate Organisation.

Don't miss out, find out!

A 1.1.5a Worksheet Answers

Part 1, Task A Part 1, Task B Part 2: 1, then the PC to MAR step is first. Correct order: the address in the PC is copied into the MAR (1); the address goes along the address bus with a read signal (2); the instruction returns along the data bus into the MDR (3); it is copied into the IR (4); the PC is incremented (5). Part 3: model description. During the fetch stage, the address in the PC is copied to the MAR. The...

Help