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Such processors thus support at most 64 KiB of total byte-addressable memory. In older computers with processors having a 16-bit address bus (such as the MOS Technology 6502 and the Zilog Z80), 65535 (FFFF 16) is the highest addressable memory location, with 0 (0000 16) being the lowest.Some computer programming environments may have predefined constant values representing 65535, with names like MAX_UNSIGNED_SHORT. 65535 occurs frequently in the field of computing because it is 2 16 − 1 (one less than 2 to the 16th power), which is the highest number that can be represented by an unsigned 16-bit binary number.
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