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What (who) is real-mode - definition

OPERATING MODE OF ALL X86-COMPATIBLE CPUS

Realmode; Real Mode; Real-address mode; Real address mode; True real mode; Real-mode

Real mode

Real mode, also called real address mode, is an operating mode of all x86-compatible CPUs. The mode gets its name from the fact that addresses in real mode always correspond to real locations in memory.

https://en.wikipedia.org/wiki/Real_mode

real mode

An operating mode of Intel 80x86 processors. The opposite of protected mode. (1995-03-29)

Unreal mode

VARIANT OF REAL MODE IN X86 COMPUTING

Big real mode; Flat real mode; Paged real mode; Huge real mode; 32-bit real mode; Big unreal mode; Huge unreal mode; Real big mode; Voodoo Memory Manager; Voodoo Memory Management; Voodoo Memory Management System; Real Big Mode; Big Real Mode; Flat Real Mode; HugeRealMode; HugeRealMode driver; Pseudo real execution mode; Unreal execution mode; 386 real big mode; 386 Real Big Mode; 386 big mode; 386 Big Mode; Real-mode flat memory model; Pseudo-real execution mode; Pseudo real mode; Pseudo-real mode; Unreal Mode

In x86 computing, unreal mode, also big real mode, huge real mode, flat real mode, or voodoo mode is a variant of real mode, in which one or more segment descriptors has been loaded with non-standard values, like 32-bit limits allowing access to the entire memory. Contrary to its name, it is not a separate addressing mode that the x86 processors can operate in.

https://en.wikipedia.org/wiki/Unreal_mode

Wikipedia

Real mode

Real mode, also called real address mode, is an operating mode of all x86-compatible CPUs. The mode gets its name from the fact that addresses in real mode always correspond to real locations in memory. Real mode is characterized by a 20-bit segmented memory address space (giving 1 MB of addressable memory) and unlimited direct software access to all addressable memory, I/O addresses and peripheral hardware. Real mode provides no support for memory protection, multitasking, or code privilege levels.

Before the release of the 80286, which introduced protected mode, real mode was the only available mode for x86 CPUs; and for backward compatibility, all x86 CPUs start in real mode when reset, though it is possible to emulate real mode on other systems when starting on other modes.

https://en.wikipedia.org/wiki/Real mode