86/286/386/486/Pentium

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The 8086 CPU is the first CPU to ever have the x86 architecture. It was used in the IBM PC which was widely popular.

Emulators

Name Operating System(s) Latest Version 8086 emulation*¹ 286 emulation 386 emulation*² 486 emulation*³ Pentium emulation*⁴ Active Recommended
PC
86Box Windows Git
PCem Windows, Linux 14 ~
DOSBox-X Multi-platform 0.82.10 ~
DOSBox Windows, Linux, FreeBSD and more 0.74-2
SVN
QEMU Windows, Linux, macOS 3.1.0-rc2 ? ? ? ? ?
Bochs Windows, Linux, BSD, OS/2,
BeOS, MorphOS, AmigaOS
2.6.9
PCjs Web browser Git
MAME Multi-platform 0.204 ? ~ ~ ~ ~
DOSEmu Linux 1.4.0 ? ? ? ? ?
DOSEmu2 Linux 2.0pre8 ? ? ? ? ?
Mobile
QEMU Android 3.1.0-rc2 ? ? ? ? ?
Bochs Android 2.6.9
aDOSBox Android 0.2.5
AnDOSBox Android 1.2.8
DosBox Turbo Android 2.2.0
gDosBox Android 0.7.5.5
Magic Dosbox Android 1.0.61
Consoles
Bochs PlayStation 2 2.6.9

*¹8086 emulation includes the 8088 CPU. *²386 emulation includes the SX and SL. *³486 emulation includes variants. *⁴Pentium emulation includes variants, Pentium MMX, Pentium Pro, and Pentium II.

Notes

DOSBox-X
The Git readme file (Under the Comments on what DOSBox-X is lacking) for DOSBox-X states that "DOSBox-X contains code only to emulate the 8088 through the Pentium Pro. If Pentium II or higher emulation is desired, consider using Bochs or QEMU instead. DOSBox-X may eventually develop Pentium II emulation..." if the user demand is there.
MAME
The emulation of various CPU types seen here regarding MAME are all over the place in the change logs and seem to be confusing. But MAME has preliminary support for the families of 286, 386/i386, 486/i486 and almost the entire range of the Pentium CPUs. But the emulation of color, sound and graphics for various CPUs and PC's based on the 286/386/486 architecture are good. According to ProjectMESS, many IBM PC/AT 5170 family PC's running the 286 CPU have preliminary support. MAME 0.146u3 (Jul 2012) added CPU types for Pentium MMX, Pentium Pro, Pentium II, Pentium III and Pentium 4.
- MAME compat list showing the sector for several IBM type PC systems - most of which may work fine.
- wiki.mamedev.org's search results for Pentium (e.g. 0.100u4, 0.103u4, 0.146u3, 0.148, 0.152, 0.156)
- wiki.mamedev.org's list for MACHINE_NOT_WORKING (Few systems based on a Pentium CPU)
- wiki.mamedev.org's list for MACHINE_IS_SKELETON drivers (Several PC's/systems based on a Pentium CPU)

CPUs

Intel 8086

The 8086 CPU was released on June 8, 1978, at 5 MHz and had a max clock speed of 10 MHz. After the original launch, Intel released the 8086-1 which had a clock speed of 10MHz. In May/June of 1980, the 8086-2 at 8 MHz was released. The 8086-4 CPU came after the 8086-2 CPU complete skipping 8086-3, it was clocked at 4 MHz. The last 8086 CPU to be released was the I8086 in May/June of 1980. The 8086 CPU was used in computers such as the IBM PC, IBM PS/2, AT&T 6300 PC, and more.

Intel 8088

The 8088 CPU was released on July 1, 1979, and had a default clock speed of 4.77 MHz and a max clock speed of 10 MHz.

Intel 286

The 286 CPU was released on February 1, 1982, and had a clock speed of 4 MHz for a while then was changed to 6 MHz. It had a max clock speed of 25 MHz.

Intel 386DX

The 386DX CPU was released in October of 1985 with a clock speed of 12 MHz. The max clock speed was 33 MHz. The 386DX was supposed to be introduced at 16 MHz, but for technical reasons, they had to settle for 12 MHz.

Intel 386SX

The 386SX was released in 1988 and was intended for lower-cost PCs at the home. It has the same clock speeds as the 386DX.

Intel i386SL

The i386SL was released for use in portable computers around that time and had a clock speed of 20 MHz. Its max clock speed is 25 MHz.

Intel i486

Full list of i486 CPUs

Intel i486DX

The i486DX CPU was released in 1989 and had a minimum clock speed of 20 MHz and a max clock speed of 50 MHz.

Intel i486SX

The i486SX CPU was released in September of 1991 and had a clock speed of 16 MHz. It has a max clock speed of 33 MHz.

Intel i486DX2

The i486DX2 CPU was released in March of '92 and had a clock speed of 40/20 MHz. It had a max clock speed of 66/33 MHz.

Intel i486SL

The i486SL CPU was released in November of 1992 and was used for portable computers. It had a minimum clock speed of 20 MHz and a max clock speed of 33 MHz.

Intel i486DX-S

The i486DX2 CPU was released in June of '93 and had a clock speed of 33 MHz. Its max speed is 55 MHz.

Intel i486DX2-S

The i486DX2-S CPU was released in June of '93 and had a clock speed of 40/20 MHz and later had a clock speed of 66/33 MHz.

Intel i486SX-S

The i486SX-S CPU was released in June of '93 and had a clock speed of 25 MHz. Its max clock speed was 33 MHz.

Intel i486SX2

The i486SX2 was released in March of 1994 and had a clock speed of 50/25 MHz. It had a max of 66/33 MHz.

IntelDX4

The IntelDX4 CPU was released in March of '94 and had a whopping clock speed of 75/25 MHz. It even had a more blazing clock speed of 100/33 MHz.

Intel i486DX2WB

The i486DX2WB CPU was released in October of '94 and had a clock speed of 50/25 MHz. It also eventually had a clock speed of 66/33 MHz.

IntelDX4WB

The IntelDX4WB CPU was released in October of '94 and had a whopping clock speed of 100/33 MHz.

Intel i486DX2 (P24LM)

The i486DX (P24LM) CPU was released in 1994 and had a clock speed of 90/30 MHz. Its highest clock speed is 100/33 MHz.

Intel i486GX

The i486GX CPU was released in 1994 and had a clock speed up to 33 MHz. The reason for this is for smaller portable computers.

Intel i486 Overdrive

The i486 Overdrive CPUs were meant to upgrade computers and had a clock speed of 40 MHz. It had a max clock speed of 100 MHz.

Pentium

Full list of Pentium CPUs

Pentium 50

The Pentium 50 CPU was released on March 22, 1993, and had a clock speed of 50 MHz, as the name "Pentium 50" hints.

Pentium 60

The Pentium 60 CPU was released the same time as the Pentium 50 was and had a clock speed of 60 MHz.

Pentium 66

The Pentium 66 CPU was released the same time as the Pentium 50 and 60. It had a clock speed of 67 MHz and not 66.

Pentium 75

The Pentium 75 CPU was released on October 10, 1994, and was clocked at 75 MHz.

Pentium 90

The Pentium 90 CPU was released on March 7, 1994, and had a clock speed of 90 MHz.

Pentium 100

The Pentium 100 CPU was released on March 7, 1994, and had a clock speed of 100 MHz.

Embedded Pentium 100

The Embedded Pentium 100 was released for computers that were not meant to be able to have different components and was clocked at 100 MHz.

Pentium 120

The Pentium 120 was released on March 27, 1995, and had a clock speed of 120 MHz.

Pentium 133

The Pentium 133 CPU was released on June 1, 1995, and had a clock speed of 133 MHz.

Pentium 150

The Pentium 150 CPU was released on January 4, 1996, and had a clock speed of 150 MHz.

Pentium 166

The Pentium 166 CPU was released on January 4, 1996, and had a clock speed of 167 MHz and not 166 as the name implies.

Pentium 200

The Pentium 200 CPU was released on June 10, 1996, and had a clock speed of 200.

Embedded Pentium 133

The Embedded Pentium 133 CPU was released for computers that were not supposed to have changeable components. It had a clock speed of 133 MHz.

Embedded Pentium 133 with VRE

It's the exact same as the Embedded Pentium 133, but with VRE.

Embedded Pentium 166

The Embedded Pentium 166 CPU was released for computer with non-changeable parts.

Pentium MMX

Full list of Pentium MMX CPUs

Pentium MMX 166

The Pentium MMX 166 was released on January 8, 1997, and had a clock speed of 167 MHz.

Pentium MMX 200

The Pentium MMX 200 was released on January 8, 1997, and had a clock speed of 200 MHz.

Pentium MMX 233

The Pentium MMX 233 CPU was released on June 2, 1997, and had a clock speed of 233 MHz.

Embedded Pentium MMX 200

The Embedded Pentium MMX 200 CPU was released on September 29, 1997 and had a clock speed of 200 MHz. It was for computers with non-removable compents.

Embedded Pentium MMX 233

The Embedded Pentium MMX 233 CPU was released for computers with non-removable parts. It had a clock speed of 233 MHz.

Pentium Pro

Full list of Pentium Pro CPUs

Pentium Pro 150

The Pentium Pro 150 CPU was released on November 1, 1995, and had a clock speed of 150 MHz.

Pentium Pro 166

The Pentium Pro 166 CPU was released on November 1, 1995, and had a clock speed of 167 MHz.

Pentium Pro 180

The Pentium Pro 180 CPU was released on November 1, 1995, and had a clock speed of 180 MHz.

Pentium Pro 200

The Pentium Pro 200 CPU was released on November 1, 1995, and had a clock speed of 200 MHz.

Pentium II

Full list of Pentium II CPUs

Pentium II 233

The Pentium II 233 CPU was released on May 7, 1997, and had a clock speed of 233 MHz.

Pentium II 266

The Pentium II 266 CPU was released on May 7, 1997, and had a clock speed of 167 MHz.

Pentium II 300

The Pentium II 300 CPU was released on May 7, 1997, and had a clock speed of 300 MHz.

Pentium II 333

The Pentium II 333 CPU was released on January 26, 1998, and had a clock speed of 333 MHz.

Pentium II Overdrive

The Pentium II Overdrive was an upgrade for computers with weaker CPUs. It was released on August 10, 1998. It had a clock speed of 333 MHz, the same as the Pentium II 333.

Pentium II 350

The Pentium II 360 was released on April 15, 1998, and had a clock speed of 350 MHz.

Pentium II 400

The Pentium II 400 was released on April 15, 1998, and had a clock speed of 400 MHz.

Pentium II 450

The Pentium II 450 was released on August 24, 1998, and had a clock speed of 450 MHz.

Mobile Pentium II 233

The Mobile Pentium II 233 was released on April 2, 1998, and had a clock speed of 233 MHz.

Mobile Pentium II 266

The Mobile Pentium II 266 was released on April 2, 1998, and had a clock speed of 266 MHz.

Mobile Pentium II 300

The Mobile Pentium II 300 CPU was released on September 9, 1998, and had a clock speed of 300 MHz.

Mobile Pentium II 266PE

The Mobile Pentium II 266PE was released on January 9, 1999, and had a clock speed of 267 MHz.

Mobile Pentium II 300PE

The Mobile Pentium II 300PE was released on January 25, 1999, and had a clock speed of 300 MHz.

Mobile Pentium II 333

The Mobile Pentium II 333 was released on January 25, 1999, and had a clock speed of 333 MHz.

Mobile Pentium II 366

The Mobile Pentium II 366 was released on January 25, 1999, and had a clock speed of 367 MHz.

Mobile Pentium II 400

The Mobile Pentium II 400 CPU was released on June 14, 1999, and had a clock speed of 400 MHz.