3.4 Computer SystemsIntroduction

The Library Search

Part of MAR, MDR & Registers · GCSE GCSE Computer Science revision

This introduction covers The Library Search 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 1 of 8 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 1 of 8

Practice

15 questions

Recall

10 flashcards

The Library Search

Imagine you're in a massive library looking for a specific book. First, you write down the shelf number on a slip of paper (that's the MAR - it holds the ADDRESS of where to look). You take that slip to the librarian, who finds the shelf, grabs the book, and hands it to you. You now hold the actual book (that's the MDR - it holds the actual DATA that was found). The MAR says WHERE, the MDR holds WHAT. Simple as that!

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.

CPU Registers Detail Deep Dive: How MAR and MDR Work Together MAR - Memory Address Register

Practice Questions for MAR, MDR & Registers

What does MAR stand for?

A. Memory Access Register
B. Memory Address Register
C. Memory Arithmetic Register
D. Main Address Register

1 markfoundation

Explain the difference between the MAR and the MDR.

2 marksstandard

Quick Recall Flashcards

What does MAR hold?

The address of data to be read/written (WHERE)

What does MDR hold?

The actual data being transferred (WHAT)

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MAR, MDR & Registers

CPU Registers Detail