Why Operating System Have only 65,535 port Numbers

Answer Posted / dez

In older computers with processors operating with a 16-bit
address bus (such as the MOS Technology 6502 and the Zilog
Z80), 65535 was the highest addressable memory location.
Such processors thus supported at most 64 kibibytes (64
KiB) of total memory. Of course, this is assuming byte-
addressed memory.

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