This introduction covers The Library Search within MAR & MDR for GCSE Computer Science. Revise MAR & MDR in Systems Architecture for GCSE Computer Science with 15 exam-style questions and 10 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 1 of 7 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 7
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!