MAR vs MDR - Quick Comparison
Part of MAR, MDR & Registers · GCSE GCSE Computer Science revision
This key facts covers MAR vs MDR - Quick Comparison 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 6 of 8 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 6 of 8
Practice
15 questions
Recall
10 flashcards
MAR vs MDR - Quick Comparison
| Feature | MAR | MDR |
|---|---|---|
| Stands for | Memory Address Register | Memory Data Register |
| Holds | Address (WHERE) | Data (WHAT) |
| Connected to | Address Bus | Data Bus |
| Direction | One-way (to memory) | Two-way (to/from memory) |
MAR = Memory Address Register (A for Address - WHERE)
MDR = Memory Data Register (D for Data - WHAT)
A comes before D in the alphabet, just like you need to know the ADDRESS before you can get 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
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