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Conventional MemoryConventional memory is contiguous memory directly used by applications running on any Intel 80x86 microprocessor that is running in real mode under unaugmented MS-DOS. Addressed from 0 to 640KB (up to 736KB with special device drivers and hardware). The original 8088 processor could address up to 1MB (220, 20 being the number of address lines which come out of the CPU) of memory directly; however, IBM chose to reserve the upper 384KB for ROM and other uses.