From Higher Computing Science
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- The address bus identifies locations in memory that can be used to read or write data. An address such as 10011001100110011110101101111001 would be used to identify the location in memory to read from, or write to.
- The address bus is unidirectional – addresses only ever transfer from the processor to the memory.
- The size of the address bus determines the number of locations in memory - 2 to the power of the number of lines on the address bus. This can be multiplied by the size of the data bus to calculate the total addressable memory.