real mode
(1) Default mode of operation for the Intel 80286 and 80386/80486 processors, and the only mode of operation for the 8086 processor. In real mode, the processor acts as a 16-bit device, its physical memory address space is limited to 1MB, and memory references translate directly to physical addresses. With the 80386 and 80486, paging is not supported in real mode. (2) Execution mode for Windows 3.0, which provides applications with up to 640KB of conventional memory (384KB after loading DOS, Windows and other memory-resident software) and which supports expanded memory using LIM EMS Version 4.0 specifications.