kilobyte
Noun
Meaning
a unit of information equal to 1024 bytes
a unit of information equal to 1000 bytes
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But as computer main memory in a binary-addressed system is manufactured in sizes that were easily expressed as multiples of 1024, kilobyte, when applied to computer memory, came to be used to mean 1024 bytes instead of 1000.
At that time, it was proposed that the terms kilobyte and megabyte be used only for 10 3 bytes and 10 6 bytes, respectively.
Gigabyte was formally defined in IEEE Std 610.10-1994 as either main or 2 30 bytes. citation Kilobyte, Kbyte, and KB are equivalent units and all are defined in the obsolete standard, IEEE 100-2000. citation "kB See kilobyte."
In practice, kilobyte is still commonly used to refer to 1024 bytes.
Like PL/I F, it was a multiple pass compiler with a 44 kilobyte design point, but it was an entirely new design.
The IEC further specified that the kilobyte should only be used to refer to 1000 bytes.