MDR: GCSE Computer Science Definition

What is the MDR?

The Memory Data Register (MDR) holds the data or instruction that has been fetched from main memory (RAM) during the 'fetch' stage of the fetch-decode-execute cycle.

It acts as a buffer between the CPU and main memory.

MDR Revision Resources to Ace Your Exams

Explore MDR in more detail and master other key related terms such as the memory address register (MAR) and accumulator (ACC) in our revision note pages here:

Von Neumann Architecture (OCR GCSE Computer Science)
CPU components & their function (AQA GCSE Computer Science)

Challenge yourself with our expertly created topic questions and reinforce your learning with our interactive flashcards. 

GCSE Computer Science Revision Resources