Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Memory Data Register (MDR) is the register of a computer''s control unit that contains the data to be stored in the computer storage (e.g. RAM), or the data after a fetch from the computer storage. It acts like a buffer and holds anything that is copied from the memory ready fo ...Full description
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Memory Data Register (MDR) is the register of a computer''s control unit that contains the data to be stored in the computer storage (e.g. RAM), or the data after a fetch from the computer storage. It acts like a buffer and holds anything that is copied from the memory ready for the processor to use it. The MDR is a two-way register. When data is fetched from memory and placed into the MDR, it is written to in one direction. When there is a write instruction, the data to be written is placed into the MDR from another CPU register, which then puts the data into memory.