In DOS memory management, expanded memory is a system of bank switching introduced April 24, 1985New 1-2-3 Gets 4 Megabytes of Memory, Lotus, Intel Break PC-DOS Memory Barrier, InfoWorld, Apr 29, 1985 that provided additional memory to DOS programs beyond the limit of conventional memory. Expanded memory uses parts of the address space normally dedicated to communication with peripherals for program memory as well.
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