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Unformatted text preview: use the generic word cell here rather than byte or word, because the number of bits in each addressable location, called the memorys address-ability , varies from one machine to another. However, most computers are byte-addressable today. The ad in the previous section describes a memory of 128,000,000 bytes. This means that each of the 128M bytes is uniquely addressable. Therefore, the addressability of the machine is 8 bits. The machine being described could have as many as 4,294,967,296 bytes of memory, but only 128MB are being provided. Where did that figure of possible number of bytes come from? It is 2 32 . The Pentium IV processor mentioned in the ad is a 32-bit machine. This means that the processor can distinguish 2 32 120 Chapter 5 Computing Components...
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- Fall '10