Leaving Certificate Computer Science Practice Test

Address registers play a crucial role in the operations of a computer’s CPU, particularly in the context of accessing memory. They are specifically designed to hold memory addresses, which are essential for fetching or writing data from or to various locations in memory. When the CPU needs to read data from memory, it utilizes address registers to indicate where that data is stored. Similarly, when writing data back to memory, the address register points to the location where the new data should be saved.

Understanding the function of address registers helps clarify their purpose in the overall architecture of computer systems. While they may indirectly support other functions such as executing instructions or managing system memory, their primary role is to facilitate the retrieval and storage of data by holding the addresses of the data in memory. This specificity underlines why the choice that highlights fetching or writing data aligns directly with the function of address registers.