conventional memory(redirected from 640kb barrier)
The first 640 kilobytes of an IBM PC's memory. Prior to EMS, XMS, and HMA, real mode application could use only this part of the memory.
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conventional memoryIn a PC, the first 640K of memory. The next 384K is called the "upper memory area" (UMA). The term may also refer to the entire first megabyte (1,024K) of RAM, which is the memory that DOS could directly manage without the use of additional memory managers. See DOS memory manager.
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