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Definition: 640K

(640 Kilobytes) In the early days of PCs, 640K referred to the first 655,360 bytes of memory, known as "conventional memory." It was all the RAM that could be used for applications, although techniques were used to squirrel away drivers and other small programs into the upper memory areas. See conventional memory, PC memory and PC memory management.

All There Was in 1989
This excerpt from the January 1989 issue of PC Magazine touted the drive bays of an NEC computer costing $2595 with 640K of RAM.