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Address Bus
The second piece of
our memory bus that is responsible for addressing
the individual cells (typically a cell is comprised
of 4 bits of data) of RAM is known as
the address bus. The width of the address
bus defines how much memory the processor
could potentially address. For example, if we had a 24-bit
address bus (like in an Intel 80286 processor), the processor
would have the ability to address 16 MB
of RAM (224 = 16,777,216).
If we had a 32-bit
address bus (Pentium Pro, Pentium II) the processor
could access a whopping 4 GB of RAM (232
= 4,294,967,296)! Now before you whip out you Visa card and dump
ten grand on RAM, you must know that most motherboards
today allow for a maximum of 2 GB of RAM.
This limit is typically controlled by the chipset
and BIOS of the motherboard.
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Version 1.0 - Version Date: December 6, 2004
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