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An octet is a series of 8 bits. It is an important 8-bit designation that has played a significant role in the development of the personal computer (PC) and other hardware devices.
Some of the first microprocessors used 8-bit technologies. Further IT advances led to ever greater capacities, like 8-bit to 16-bit processors. In general, the 8-bit central processing unit (CPU) required a 16-bit address bus. The actual set of permutations involved in an octet is 256. The conventional capacity of an 8-bit system is 64 kilobytes (KB).
Because the bit is a fundamental unit of data, the 8-bit label can be applied to many different aspects of IT, including address spaces, units of memory or processor capacity. Many 8-bit designations are associated with retro technologies, such as early computers that utilized an 8-bit processor for what is now considered a limited capacity.