Alan Freedman -- The Computer Language Company - Computer Desktop Encyclopedia
Computer Desktop Encyclopedia
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(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 map.

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

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64-bit computer640x480
64-bit computing64QAM
64-bit CPU650
64-bit graphics accelerator6502
64-bit operating system66 block
64-bit processing66x
64-bit version6800
64-bit Windows68000
64 bits680x0

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