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The width of an address bus, along with the size of addressable memory elements, determines how much memory can be accessed. For example, a 16-bit wide address bus (commonly used in the 8-bit processors of the 1970s and early 1980s) reaches across 2 to the power of 16 = 65,536 = 64 K memory locations, whereas a 32-bit address bus (common in Today's PC processors) can address 4,294,967,296 = 4 G locations. In most Microcomputer s the addressable elements are 8-bit '' Byte s'' (so a "K" in that case is equal to a "KB", i.e. a Kilobyte ), while there are also many examples of computers with larger "chunks" of data as their minimum physically addressable elements, notably Mainframe s, Supercomputer s, and some Workstation CPUs. SEE ALSO |
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