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Operating mode of all x86-compatible CPUs
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
Real_mode
Feature of specific microprocessor
microprocessor and later, virtual 8086 mode (also called virtual real mode, V86-mode, or VM86) allows the execution of real mode applications that are incapable
Virtual_8086_mode
Operational mode of x86-compatible CPUs
When a processor that supports x86 protected mode is powered on, it begins executing instructions in real mode, in order to maintain backward compatibility
Protected_mode
Variant of real mode in x86 computing
In x86 computing, unreal mode, also big real mode, flat real mode, or voodoo mode is a variant of real mode, in which one or more segment descriptors has
Unreal_mode
Family of backward-compatible assembly languages
processors support five modes of operation for x86 code, Real Mode, Protected Mode, Long Mode, Virtual 86 Mode, and System Management Mode, in which some instructions
X86_assembly_language
Family of instruction set architectures
(INS/OUTS) Real mode (including huge real mode), 16-bit protected mode, VM86 16-bit addressing mode VT-x will no longer provide unrestricted mode 8259 support;
X86
Operating mode for x86 CPUs
mode, while 32-bit programs and 16-bit protected mode programs are executed in a sub-mode called compatibility mode. Real mode or virtual 8086 mode programs
Long_mode
64-bit extension of x86 architecture
introduces two new operating modes: 64-bit mode and compatibility mode, along with a new four-level paging mechanism. In 64-bit mode, x86-64 supports significantly
X86-64
Unconditional jump instruction in x86 assembly language
that perform a jump; depending on whether the processor is in real mode or protected mode, and an override instruction is used, the instructions may take
JMP_(x86_instruction)
Memory segmentation on Intel x86
memory and memory protection; the original mode was renamed real mode, and the new version was named protected mode. The x86-64 architecture, introduced in
X86_memory_segmentation
Computer assembly language instruction
in the interrupt table to be executed. INT is widely used in real mode. In protected mode, INT is a privileged instruction. A software interrupt is a long
INT_(x86_instruction)
Operating mode of x86 central processor units
inaccessible to other operating modes of the CPU by the firmware. System Management Mode can address up to 4 GB memory as huge real mode. In x86-64 processors,
System_Management_Mode
MSDOS-like operating system
Area (HMA), the first 64 KB of extended memory which are accessible in real mode. This freed up the equivalent amount of critical "base" or conventional
DR-DOS
BIOS interrupt call
typically sets up a real mode interrupt handler at this vector that provides video services. Such services include setting the video mode, character and string
INT_10H
Data structure in microprocessors
0x21, and Linux provides the syscall interface at the vector 0x80. In real mode, the interrupt table is called IVT (interrupt vector table). Up to the
Interrupt_descriptor_table
1990 Microsoft operating system version
run in "protected mode", to allow multiple programs at once, among other benefits. MS-DOS was originally designed to run in real mode and run only one
Windows_3.0
Video board software standard
VBE provide only a real mode interface, which cannot be used without a significant performance penalty from within protected mode operating systems. Consequently
VESA_BIOS_Extensions
32-bit version of x86 architecture
modes that operate on the IA-32 ISA for backwards compatibility. Even given the contemporary prevalence of x86-64, as of today, IA-32 protected mode versions
IA-32
Microprocessor model
(or must) be used in real mode to set up and switch to protected mode, and a few (such as SMSW and LMSW) are useful for real mode itself. The Intel 80286
Intel_80286
DOS specification
to many features of the new PC processors of the time not available in real mode. It was initially developed by Microsoft for Windows 3.0, although Microsoft
DOS_Protected_Mode_Interface
Low level firmware interface to the hardware
real address mode (Real Mode) of the x86 CPU, so programs that call BIOS either must also run in real mode or must switch from protected mode to real
BIOS_interrupt_call
2000 Microsoft operating system version
showed the first real changes from Windows 98, including importing much of the look-and-feel from Windows 2000, and the removal of real-mode DOS. Industry
Windows_Me
Computer graphics standard from 1987
VGA text mode was introduced in 1987 by IBM as part of the VGA standard for its IBM PS/2 computers. Its use on IBM PC compatibles was widespread through
VGA_text_mode
Section of computer memory in PC compatibles
DOS and Windows operating systems. DOS programs, running in real mode or virtual x86 mode, cannot directly access this memory, but are able to do so through
Extended_memory
Spreadsheet software
machine, so Lotus took advantage of this by supporting a "split" screen mode whereby the user could display the worksheet portion of 1-2-3 on the sharper
Lotus_1-2-3
Type of computer software program
software to run in a protected mode environment even though the host operating system is only capable of operating in real mode. DOS extenders were initially
DOS_extender
made it possible to page MS-DOS applications to disk. Without it, if the real mode disk code (the Int 13h handler) was paged out, the virtual DOS machine
Microsoft_32-bit_disk_access
Concept in computing
requiring virtual 8086 mode to run (e.g., in Windows). 32-bit x86 processors have two legacy modes: real mode and virtual 8086 mode. Real mode causes the processor
Legacy_mode
Series of Microsoft operating systems
retained in order to facilitate booting into Windows as well as providing real mode support for DOS. The first version of the Windows 9x series was Windows
Windows_9x
Extension of the 8.3 file naming scheme
DOS commands such as DIR would show long file names as well. Some small real mode DOS programs have also been written over the years, although many have
Long_filename
Layer of protection in computer systems
this is exclusive to the case where protected-mode drivers or DOS extenders are used; as a real-mode OS, the system runs with effectively no protection)
Protection_ring
Architecture of computer operating systems
NLS, CP 437.NLS, UNICODE.NLS, LOCALE.NLS – Keyboard layouts RMM.PDR – Real Mode Mapper Virtual Device The system may also use CONFIG.SYS, which contains
Architecture_of_Windows_9x
to transition from protected mode to real mode because the 286 did not allow the CPU to go from protected mode to real mode unless the CPU is reset. The
Keyboard controller (computing)
Keyboard_controller_(computing)
Filename extension for a native executable program
Windows 95, use Registry Editor in real mode. Note that the switches listed in this article only work in real-mode. Pietrek, Matt (February 2002). "An
.exe
Way to produce very short laser bursts
the mode spacing of the laser, Δν = 1/τ. The duration of each pulse of light is determined by the number of modes oscillating in phase (in a real laser
Mode_locking
32-bit microprocessor by Intel
debugging. The 386 featured three operating modes: real mode, virtual mode, and protected mode. The protected mode, which debuted in the 286, was extended
I386
RAM area of an IBM AT or compatible computer
bytes above the one megabyte in an IBM AT or compatible computer. In real mode, the segmentation architecture of the Intel 8086 and subsequent processors
High_memory_area
First sector of partitioned PC computer disk
the processor to real mode, then begin to execute the MBR program, and so the beginning of the MBR is expected to contain real-mode machine code. Since
Master_boot_record
Computer operating system
MS-DOS 7 is a real mode operating system for IBM PC compatibles. Unlike earlier versions of MS-DOS, it was not released separately by Microsoft, but included
MS-DOS_7
English electronic band
Depeche Mode (/dəˌpɛʃ ˈmoʊd/ də-PESH MOHD) are an English electronic band formed in Basildon, Essex in 1980. Originally formed with the line-up of Dave
Depeche_Mode
Firmware for hardware initialization and OS runtime services
of PS/2 machines, IBM divided the System BIOS into real- and protected-mode portions. The real-mode portion was meant to provide backward compatibility
BIOS
Digital telecommunications protocol for voice, video, and data
Asynchronous Transfer Mode (ATM) is a telecommunications standard defined by the American National Standards Institute and International Telecommunication
Asynchronous_Transfer_Mode
Signal in the system bus of an x86-based computer system
system memory in protected mode. However, the CPU was supposed to emulate an 8086's behavior in real mode, its startup mode, so that it could run operating
A20_line
Computer operating system
name, runs on both Intel 8086 and Intel 80286 processors. It runs in real mode but can make use of the high memory area. In addition to full Windows
Microsoft_Windows
1987 Microsoft operating system version
different variants: a base edition for 8086 real mode, and Windows/386, an enhanced edition for i386 protected mode. Windows 2.0 differs from its predecessor
Windows_2.0
Undocumented Intel 80286 and 80386 instructions
access to all memory from real mode, without having to switch it into unreal mode (which requires switching into protected mode, accessing memory and finally
LOADALL
Subsystem for 32-bit Windows for running 16-bit DOS & Windows programs
recompilation) or can rely on the virtual 8086 mode of the Intel 80386 processor, which allows real mode 8086 software to run in a controlled environment
Virtual_DOS_machine
in protected mode, granting access to many features of the processor not available in real mode. It was supplanted by DOS Protected Mode Interface (DPMI)
Virtual Control Program Interface
Virtual_Control_Program_Interface
Association football club in Spain
Real Madrid Club de Fútbol (Spanish pronunciation: [reˈal maˈðɾið ˈkluβ ðe ˈfuðβol] ) is a Spanish professional association football club based in Madrid
Real_Madrid_CF
1995 Microsoft operating system version
storage device, or if a device is forced to run in compatibility mode, the Real Mode Mapper can access it through MS-DOS. 32-bit Windows programs are
Windows_95
Device setting to suspend radio-frequency signal transmission
Airplane mode (also known as aeroplane mode, flight mode, offline mode, flight safe mode or standalone mode) is a setting available on portable devices
Airplane_mode
Division of computer's primary memory into separately relocatable segments or sections
the operating system, then identical code can run in real mode or protected mode, but most real-mode software computes new values for the segment registers
Memory_segmentation
Set of memory models of the x86 CPU
are a set of six different memory models of the x86 CPU operating in real mode which control how the segment registers are used and the default size
X86_memory_models
Programmable interval timer IC
18.2 Hz. Under these real mode operating systems, the BIOS accumulates the number of INT 8 calls that it receives in real mode address 0040:006c, which
Intel_8253
2015 mixtape by Future and Zaytoven
Beast Mode is the fourteenth mixtape by American rapper Future and American producer Zaytoven. It came out on January 15, 2015. Along with Monster and
Beast_Mode_(mixtape)
Computer program that returns control to a non-multitasking OS without exiting
real mode to protected mode. However, since DOS and most DOS programs run in real mode (VCPI or DPMI makes a protected-mode program look like a real-mode
Terminate-and-stay-resident program
Terminate-and-stay-resident_program
Scientific Calculator
available to the user, and has 4 basic operational modes: Real mode: it is the basic operational mode for directly performing standard algebraic and statistical
Sharp_EL-5120
List of x86 microprocessor instructions
in 80286 add support for x86 protected mode. Some but not all of the instructions are available in real mode as well. The descriptors used by the LGDT
List_of_x86_instructions
First 640 KB of RAM under DOS
memory in protected mode. The 1 MB barrier also remained as long as the 286 was running in real mode, since DOS required real mode which uses the segment
Conventional_memory
1990s small battery-powered computer
could also run other operating systems such as GEOS, Windows 1.0-3.0 (in Real mode only), or MINIX 2.0. Most Palmtop PCs have been based on a static hardware
Palmtop_PC
BIOS interrupt call
vector in an x86-based computer system. The BIOS typically sets up a real mode interrupt handler at this vector that provides keyboard services. This
INT_16H
Free virtualization and emulation software
by using processor and peripheral emulation only for kernel-mode and real-mode code. KQEMU could execute code from many guest operating systems even
QEMU
BIOS interrupt call for disk access
x86-based (IBM PC-descended) computer system. The BIOS typically sets up a real mode interrupt handler at this vector that provides sector-based hard disk
INT_13H
Address from which a CPU starts fetching instructions after a reset
maps to physical address FFFFF0h in real mode. This was changed to allow sufficient space to switch to protected mode without modifying the CS register
Reset_vector
Value indicating that a referenced dataset is invalid or doesn't exist
certain circumstances where this is not the case. For example, in x86 real mode, the address 0000:0000 is readable and also usually writable, and dereferencing
Null_pointer
Techniques employed to give access to more than 640 kibibytes
need to maintain backward compatibility to the original PC design and real-mode DOS, while allowing computer users to take advantage of large amounts
DOS_memory_management
Types of computer processing
Data processing modes or computing modes are classifications of different types of computer processing. Interactive computing or Interactive processing
Processing_mode
applications at the time were real mode, and Windows/386 could run them over the protected mode kernel by using the virtual 8086 mode, which was new with the
Microsoft Windows version history
Microsoft_Windows_version_history
MS Mode is a Dutch fashion retailer operating over 200 stores in the Netherlands, France, Belgium, Spain, and Luxembourg, founded by Max Abram. The business
MS_Mode
Concurrent DOS for 8086 and 8080 CPUs Concurrent DOS 286 Concurrent DOS XM, a real-mode variant of Concurrent DOS with EEMS support Concurrent DOS 386 Concurrent
List_of_operating_systems
Computer science process
Geos was originally intended to be converted to protected mode very early on […], with real mode only being a "legacy option" […] almost every single line
Dynamic_dispatch
Computer memory addressing model
require fewer bytes. Within the x86 architectures, when operating in the real mode (or emulation), physical address is computed as: Address = 16 × segment
Flat_memory_model
Text mode multitasking operating environment
memory above DOS's limit. However, in either case, it runs in real mode rather than protected mode, meaning that a misbehaving program can still crash the system
DESQview
Reference to a specific memory location
address translation Real addresses: addresses generated from dynamic address translation, and addresses used by code running in real mode Absolute addresses:
Memory_address
1992 point-and-click adventure game
SCUMM engine and required a 286-based PC, although it still runs as a real-mode DOS application. The CD talkie version required EMS memory enabled to
Indiana Jones and the Fate of Atlantis
Indiana_Jones_and_the_Fate_of_Atlantis
excite or to annihilate a specific mode without influencing any other mode; there is no dissipation. In most real systems, however, there is at least
Mode_coupling
Discontinued orthodox file manager software
the standard Windows APIs. In order to preserve LFNs while working in real mode, Norton Commander 5.51 required the use of a terminate-and-stay-resident
Norton_Commander
Linux boot loader
loadlin is a Linux boot loader that runs under 16-bit real-mode DOS (including the MS-DOS mode of Windows 95, Windows 98 and Windows Me startup disk).
Loadlin
Set of extended DOS memory management services
software to allocate and use memory in protected mode without having to tunnel all requests through real mode DOS, DPMS at the same time can help improve system
DOS_Protected_Mode_Services
Successor to the Intel 386
selector" registers could be set to a neutral value in protected mode, or to zero in real mode, and using only the 32-bit "offset registers" (x86-terminology
I486
Filename extension
drivers or hardware configurations for the system. Most DOS .sys files are real mode device drivers. Certain files using this extension are not, however: MSDOS
Windows_System_File
CPU microarchitecture by Intel
latency and support for VMX Unrestricted mode, allowing 16-bit guests to run in real mode and big real mode. Support for "Huge Pages" of 1 GB in size
Westmere_(microarchitecture)
Implementation of the GNU toolchain for DOS
IA-32 processors. Newer x86 CPUs with VT-x do support paged real mode and unrestricted guest mode execution. Free and open-source software portal FreeDOS
DJGPP
DOS compatibility layer for Linux
DOSEMU includes an 8086 processor emulator for use with real-mode applications in x86-64 long mode. DOSEMU is only available for x86 and x86-64 Linux systems
DOSEMU
Sound software development kit for video games
personal site (KE5FX.com) and contains source code for both real-mode and protected-mode programs. The Miles Sound System was used in its history by over
Miles_Sound_System
Conceptual scheme detailing the types of documentary films
Documentary mode is a conceptual scheme developed by American documentary theorist Bill Nichols that seeks to distinguish particular traits and conventions
Documentary_mode
2026 studio album by Future
In March 2026, Future announced via social media that he was in "album mode." The album was announced alongside a Spotify promotional campaign featuring
The_Real_Me_(Future_album)
2013 video game
manufacturers and 13 tracks. The single player mode included real controller ghosts similar to RR3. The single player mode was divided into 7 levels. Just like
GT Racing 2: The Real Car Experience
GT_Racing_2:_The_Real_Car_Experience
Former front-end to DOS
multitasking and protected mode features of the new 80286 CPU, as DOS and most applications were still running in 8086/8088 real mode. Even given TopView's
TopView
IDE for the C programming language
QuickC was a real mode target only compiler, with the exception of QuickC for Windows 1.0 which also allowed to compile protected mode programs, but
QuickC
Leadership concept coined by Paul Graham
Founder mode is a term used and popularized by Y Combinator co-founder Paul Graham in a September 2024 essay in response to a talk delivered by Airbnb
Founder_mode
English singer (born 1962)
known as the co-founder and lead singer of electronic music band Depeche Mode since their formation in 1980. Noted for his commanding stage presence and
Dave_Gahan
Subsystem of the Linux kernel
commands and data to the GPU and perform operations such as configuring the mode setting of the display. DRM was first developed as the kernel-space component
Direct_Rendering_Manager
Flag bit in the CPU relating to interrupts
Interrupt flag. In an x86 system this only applies to protected mode code (Real mode code may always modify the Interrupt flag). CLI and STI are privileged
Interrupt_flag
English musician (1961–2022)
was an English musician and founding member of the electronic band Depeche Mode. In 2020, he and the band were inducted into the Rock and Roll Hall of Fame
Andy_Fletcher_(musician)
Value that appears most often in a set of data
In statistics, the mode is the value that appears most often in a set of data values. If X is a discrete random variable, the mode is the value x at which
Mode_(statistics)
Hardware-assisted virtualization technology
CPUs. EPT is required in order to launch a logical processor directly in real mode, a feature called "unrestricted guest" in Intel's jargon, and introduced
Second Level Address Translation
Second_Level_Address_Translation
Low-power mode for electronic devices
Sleep mode (or suspend to RAM or stand by) is a low-power mode for electronic devices such as computers, televisions, and remote controlled devices. Sleep
Sleep_mode
Term from the sociology of science
address specific, real-world problems, with the aim of producing knowledge (applied research) within the context of knowledge society. Mode 2 can be explained
Knowledge_production_modes
Software company
the OS/2 API and protected mode, in contrast with Microsoft's OS/2 API emulation, which ran OS/2 applications in real mode and only supported a subset
Phar_Lap_Software
REAL MODE
REAL MODE
Boy/Male
Hindu
Real
Girl/Female
Gujarati, Hindu, Indian, Kannada, Muslim
Real
Girl/Female
Tamil
Existence, Real
Boy/Male
Tamil
Existence, Real
Male
English
Variant spelling of English Neil, NEAL means "champion."
Boy/Male
Hindu
Real
Girl/Female
Tamil
Real
Male
English
English surname transferred to forename use, derived from an Old English byname, Red, READ means "red-headed or ruddy-complexioned."Â
Boy/Male
Tamil
Real
Female
Greek
Variant spelling of Greek Rhea, REAH means "ease, flow."
Female
English
English name derived from the vocabulary word, TEAL means "blue-green" or "teal duck."
Girl/Female
Muslim
Real sister
Surname or Lastname
English
English : nickname for a person with red hair or a ruddy complexion, from Middle English re(a)d ‘red’.English : topographic name for someone who lived in a clearing, from an unattested Old English rīed, r̄d ‘woodland clearing’.English : Read in Lancashire, the name of which is a contracted form of Old English rǣghēafod, from rǣge ‘female roe deer’, ‘she-goat’ + hēafod ‘head(land)’; Rede in Suffolk, so called from Old English hrēod ‘reeds’; or Reed in Hertfordshire, so called from an Old English ryhð ‘brushwood’.English : A family called Read were established in America in the early 18th century by John Read, who was born in Dublin, sixth in descent from Sir Thomas Read of Berkshire, England. His son, George Read (1733–98), was one of the signers of the Declaration of Independence, and as a lawyer helped frame the Constitution.
Surname or Lastname
English
English : variant of Dale (from the Old Kentish form del) or a habitational name from Deal in Kent, named with this word.Americanized spelling of German Diel or Diehl.Dutch (de Ruyter) : variant spelling (17th century) of De Ruiter
Boy/Male
Muslim
Real brother
Surname or Lastname
English, Spanish, and Portuguese
English, Spanish, and Portuguese : nickname for a loyal or trustworthy person, from Old French leial, Spanish and Portuguese leal ‘loyal’, ‘faithful (to obligations)’, Latin legalis, from lex, ‘law’, ‘obligation’ (genitive legis).
Girl/Female
Tamil
Existence, Real
Girl/Female
Indian
Real
Girl/Female
English
The bird teal; also the blue-green color.
Boy/Male
Tamil
Real
REAL MODE
REAL MODE
Boy/Male
Arabic, Muslim
Obedient Servant
Girl/Female
Australian, Christian, German, Latin, Teutonic
Wise Guardian; Form of Regina; Queen
Boy/Male
Bengali, Hindu, Indian, Kannada, Malayalam, Marathi
Lord Shiva
Boy/Male
American, Anglo, British, Christian, Dutch, English, French, German, Netherlands, Teutonic
Brave; Highborn and Courageous; Noble and Steadfast
Boy/Male
Arabic, Muslim
Light
Boy/Male
French, German, Latin, Swedish
Bean Farmer; A Bean
Girl/Female
Hindu
Prayer of God
Boy/Male
American, Australian, British, English
From the Fern Field
Girl/Female
Muslim
Flower
Boy/Male
Greek
Laughter.
REAL MODE
REAL MODE
REAL MODE
REAL MODE
REAL MODE
v. t.
To close by means of a seal; as, to seal a drainpipe with water. See 2d Seal, 5.
a.
True; genuine; not artificial, counterfeit, or factitious; often opposed to ostensible; as, the real reason; real Madeira wine; real ginger.
v. t.
To wind upon a reel, as yarn or thread.
v. t.
To place in the rear; to secure the rear of.
imp. & p. p.
of Read
v. t.
To breed and raise; as, to rear cattle.
n.
A Spanish coin. See Real.
a.
Actually being or existing; not fictitious or imaginary; as, a description of real life.
v. t.
To sprinkle with, or as with, meal.
v. t.
To set or affix a seal to; hence, to authenticate; to confirm; to ratify; to establish; as, to seal a deed.
v. t.
To interpret; to explain; as, to read a riddle.
n.
See Rial, an old English coin.
n.
A frame with radial arms, or a kind of spool, turning on an axis, on which yarn, threads, lines, or the like, are wound; as, a log reel, used by seamen; an angler's reel; a garden reel.
v. i.
To affix one's seal, or a seal.
a.
Royal; regal; kingly.
v. t.
To fasten with a seal; to attach together with a wafer, wax, or other substance causing adhesion; as, to seal a letter.
a.
Pertaining to things fixed, permanent, or immovable, as to lands and tenements; as, real property, in distinction from personal or movable property.
v. t.
To go over, as characters or words, and utter aloud, or recite to one's self inaudibly; to take in the sense of, as of language, by interpreting the characters with which it is expressed; to peruse; as, to read a discourse; to read the letters of an alphabet; to read figures; to read the notes of music, or to read music; to read a book.
v. t.
To promote the weal of; to cause to be prosperous.