Discussion
With reference to computer memory, memory data register is also known as ______.
Answer: A
The memory data register (MDR) holds the data that is being written into memory or has just been read from it, so it acts as a buffer between the processor and the memory, and it is also called the memory buffer register (MBR). The memory address register (MAR) is a different register: it holds the address of the location being accessed. Secondary data register and primary data register are not standard names for it. The answer is option A.
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