In marketing, iAPX (''Intel Advanced Performance Architecture''dvorak.org
/ref> with X standing in for the Greek letter χ (''chi''), romanised as "ch") was a short lived designation used for several

Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California. It is the world's largest semiconductor chip manufacturer by revenue, and is one of the developers of the x86 ser ...

microprocessors, including some

8086 The 8086 (also called iAPX 86) is a 16-bit microprocessor chip designed by Intel between early 1976 and June 8, 1978, when it was released. The Intel 8088, released July 1, 1979, is a slightly modified chip with an external 8-bit data bus (allo ...

family processors. Not being a simple initialism seems to have confused even Intel's technical writers as can be seen in their iAPX-88 Book where the asterisked expansion shows iAPX to mean ''Intel Advanced Processor System''.Intel iAPX 88 Book
(page i) The iAPX prefix originally belonged to the

Intel iAPX 432 The iAPX 432 (''Intel Advanced Performance Architecture'') is a discontinued computer architecture introduced in 1981. It was Intel's first 32-bit processor design. The main processor of the architecture, the ''general data processor'', is im ...

architecture, alias

Intel 8800 The iAPX 432 (''Intel Advanced Performance Architecture'') is a discontinued computer architecture introduced in 1981. It was Intel's first 32-bit processor design. The main processor of the architecture, the ''general data processor'', is im ...

. However, as this radical design failed in the marketplace, Intel also tried it on its more conventional 8086-family of processors, mainly used as a kind of system prefix but also to denote individual processors in the family. The 8086 based line was therefore called the iAPX 86 series for a few years during the early 1980s. This was abandoned rather soon, however. The industry around the 8088- and 80286-based

de facto standard A ''de facto'' standard is a custom or convention that has achieved a dominant position by public acceptance or market forces (for example, by early entrance to the market). is a Latin phrase (literally " in fact"), here meaning "in practice b ...

IBM PC The IBM Personal Computer (model 5150, commonly known as the IBM PC) is the first microcomputer released in the IBM PC model line and the basis for the IBM PC compatible de facto standard. Released on August 12, 1981, it was created by a team ...

and

IBM AT The IBM Personal Computer/AT (model 5170, abbreviated as IBM AT or PC/AT) was released in 1984 as the fourth model in the IBM Personal Computer line, following the IBM PC/XT and its IBM Portable PC variant. It was designed around the Intel 802 ...

designs also seldom used that naming scheme. As a result, the iAPX prefix is now, again, more closely associated with the (non-x86) iAPX 432 architecture (which, although a commercial failure, is often seen as historically important).

List of x86-related iAPX chips and multi-chip system configurations

* iAPX 86 and iAPX 86/10 refer to the

* iAPX 86/11 refers to a combination of

and 8089 (IOP) * iAPX 86/20 refers to a combination of

and

8087 The Intel 8087, announced in 1980, was the first x87 floating-point coprocessor for the 8086 line of microprocessors. The purpose of the 8087 was to speed up computations for floating-point arithmetic, such as addition, subtraction, multiplicat ...

(NPX) * iAPX 86/21 refers to a combination of

and 8089 * iAPX 86/30 refers to a combination of

and 80130 (OSP) * iAPX 88 and iAPX 88/10 refers to the

8088 The Intel 8088 ("''eighty-eighty-eight''", also called iAPX 88) microprocessor is a variant of the Intel 8086. Introduced on June 1, 1979, the 8088 has an eight-bit external data bus instead of the 16-bit bus of the 8086. The 16-bit registers a ...

* iAPX 86/11 refers to a combination of

and 8089 * iAPX 88/20 refers to a combination of

and

* iAPX 86/21 refers to a combination of

and 8089 * iAPX 86/30 refers to a combination of

and 80130 * iAPX 186 and iAPX 186/10 refer to the 80186 * iAPX 186/11 refers to a combination of 80186 and 8089 * iAPX 186/20 refers to a combination of 80186 and

* iAPX 186/21 refers to a combination of 80186,

and 8089 * iAPX 186/30 refers to a combination of 80186 and 80130 * iAPX 186/40 refers to a combination of 80186,

and 80130 * iAPX 188 and iAPX 188/10 refer to the 80188 * iAPX 188/20 refers to a combination of 80188 and

* iAPX 188/21 refers to a combination of 80188,

and 8089 * iAPX 188/30 refers to a combination of 80188 and 80130 * iAPX 286 and iAPX 286/10 refer to the

80286 The Intel 80286 (also marketed as the iAPX 286 and often called Intel 286) is a 16-bit microprocessor that was introduced on February 1, 1982. It was the first 8086-based CPU with separate, non- multiplexed address and data buses and also the ...

* iAPX 286/20 refers to a combination of

and

80287 x87 is a floating-point-related subset of the x86 architecture instruction set. It originated as an extension of the 8086 instruction set in the form of optional floating-point coprocessors that worked in tandem with corresponding x86 CPUs. These ...

* iAPX 386 refers to the

80386 The Intel 386, originally released as 80386 and later renamed i386, is a 32-bit microprocessor introduced in 1985. The first versions had 275,000 transistors Intel iAPX 432 The iAPX 432 (''Intel Advanced Performance Architecture'') is a discontinued computer architecture introduced in 1981. It was Intel's first 32-bit processor design. The main processor of the architecture, the ''general data processor'', is im ...

References

{{Reflist, refs= {{cite book , title=The iAPX 86/88, 186/188 User's Manual - Programmer's Reference , date=May 1983 , edition=1 , publisher=

Intel Corporation Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California. It is the world's largest semiconductor chip manufacturer by revenue, and is one of the developers of the x86 serie ...

, volume=2 , id=Order code 210911-001 , url=https://archive.org/stream/bitsavers_intel801866188ProgrammersReference1983_33392201/210911-001_iAPX86_88_186_188_Programmers_Reference_1983#page/n14/mode/1up {{cite book , title=iAPX 86, 88, 186 Microprocessors Part I - Workshop Notebook , publisher=

, date=June 1984 , orig-year=1983 , version=2.0 , volume=1 , id=Order code 210976-002 , url=http://bitsavers.trailing-edge.com/pdf/intel/8086/210976-002_iAPX_86,_88,_186_Microprocessors_Part_I_Ver_2.0_Jun_84_NJ7P-S.pdf , url-status=dead , archive-url=https://web.archive.org/web/20170524072600/http://bitsavers.trailing-edge.com/pdf/intel/8086/210976-002_iAPX_86,_88,_186_Microprocessors_Part_I_Ver_2.0_Jun_84_NJ7P-S.pdf , archive-date=2017-05-24 {{cite book , title=iAPX 286 Programmer's Reference Manual , publisher=

, location=Santa Clara, CA, USA , date=1983 , edition=1 , id=Order code 210498-001 , page=1-1 , url=http://bitsavers.trailing-edge.com/pdf/intel/80286/210498-001_1983_iAPX_286_Programmers_Reference_1983.pdf , url-status=dead , archive-url=https://web.archive.org/web/20141129025434/http://bitsavers.trailing-edge.com/pdf/intel/80286/210498-001_1983_iAPX_286_Programmers_Reference_1983.pdf , archive-date=2014-11-29 Intel microprocessors