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Address Bus
The address bus is a system of wires used to transfer information
in and out of the processor about memory address locations. The address
bus is imperative to other parts of the CPU because without it the CPU
would not know what section of the RAM to access for information. Similar
to other devices, the address bus follows the trend: "The larger the better".
A larger address bus allows the CPU to access a greater amount of memory.
For example, in the Intel 286 the address bus was 24-bits, which allowed
it to access 16MB of memory. Whereas, in the Intel 386, the address bus
was 32-bits, which allowed it to access up to 4GB of memory.
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