Exam Tips - MAR and MDR
Part of MAR, MDR & Registers · GCSE GCSE Computer Science revision
This exam tips covers Exam Tips - MAR and MDR within MAR, MDR & Registers for GCSE Computer Science. Revise MAR, MDR & Registers in 3.4 Computer Systems for GCSE Computer Science with 15 exam-style questions and 10 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 7 of 8 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 7 of 8
Practice
15 questions
Recall
10 flashcards
Exam Tips - MAR and MDR
The golden rule:
- MAR = Address = WHERE = Address Bus
- MDR = Data = WHAT = Data Bus
Common mistakes to avoid:
- Mixing up MAR and MDR - this loses ALL marks for that question!
- Forgetting which bus each connects to
- Saying MAR holds data or MDR holds addresses
Top tip: If you're ever unsure, think "Address before Data" - MAR works first (says where), then MDR receives the result (the data).
Keep building this topic
Read this section alongside the surrounding pages in MAR, MDR & Registers. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for MAR, MDR & Registers
What does MAR stand for?
Explain the difference between the MAR and the MDR.
Quick Recall Flashcards
15 questions on MAR, MDR & Registers — practise free
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