25 Years of IBM’s OS/2: The Strange Days and Surprising Afterlife of a Legendary Operating System

Big Blue's next-generation operating system was supposed to change everything. It didn't. But it's also never quite gone away

  • Share
  • Read Later
PC World

The July 1987 issue of PC World magazine featured a centerfold (!) of Microsoft CEO Bill Gates proudly sporting an OS/2 button

It was one of the most ambitious computer-product announcements in history. On April 2, 1987, at twin press conferences in New York and Miami, IBM unveiled its plans to reinvent the PC industry, which it had jump-started less than six years earlier with the introduction of the first IBM PC. The company introduced four new computers dubbed the PS/2 line, including an $11,000 model that it said was seven times faster than current models. The new products were rife with advanced features, including 32-bit processors, fancy graphics, 3.5-in. hard-shell floppy-disk drives and optical storage.

And the new hardware was accompanied by a next-generation operating system, OS/2. Co-developed by IBM and Microsoft, it was intended to replace DOS, the aging software that then powered most of the planet’s microcomputers.

(PHOTOS: A Brief History of the Computer)

It never did. Instead, Microsoft’s Windows reinvigorated DOS, helping end IBM’s control of the PC standard it had created. By the mid-1990s, IBM had given up on OS/2 — a major step in the company’s slow-motion retreat from the PC industry, which it completed in 2005 by agreeing to sell its PC division to China’s Lenovo.

But while OS/2 never truly caught on, it’s also never gone away. Even if you believe that you never saw it in action, there’s a decent chance that you unwittingly encounter it occasionally. More on that later.

Back in 1987, the possibility that the world might politely refuse to do as IBM instructed would have seemed implausible. Apple’s iconic “1984” TV commercial, which showed IBM customers as an army of unquestioning drones, was fantasy — but fantasy based on a certain degree of truth. Nobody, it was famously said, was ever fired for buying IBM. Yet OS/2 was an IBM product that the market, in general, chose not to buy.

When it was announced, however, the need seemed obvious, and its potential appeared to be huge. Tech writer Esther Schindler remembers:

I happened to be working at [leading software developer] Lotus as a contractor 25 years ago, on the day OS/2 1.0 was announced. A couple of guys had been locked in a room in the basement with several PS/2s and OS/2 1.0 … and emerged to show up the marvelous capabilities of the new hardware.

OS/2 promised multitasking, not just task switching. It knew how to handle memory … It did a heck of a lot of cool things … I don’t think it’s easy for young whippersnappers to grasp how big a deal the PS/2 and OS/2 were at the time. We were certain, absolutely certain, that nothing would be the same again. The closest I can come to it was the reaction after the first iPhone was released: the sense that It’s all different now.

As it turns out, the PS/2 and OS/2 1.0 didn’t have the impact everyone expected … but we thought they would.

OS/2 felt so important at first because DOS was still a gussied-up version of the rickety 16-bit software that Microsoft had licensed in 1980 for $10,000 from a tiny company called Seattle Computer Products. Windows, which first appeared in 1985, sat atop DOS and inherited its many flaws, such as the inability to utilize large amounts of memory and an eight-character limit on file names. The whole mess couldn’t utilize memory properly and was prone to frequent crashes. It was begging to be replaced.

Vaporous Beginnings

Of course, OS/2 couldn’t begin to replace anything until it shipped. And like many a technology product before and after, it remained vaporware for months after being announced. At the April 1987 launch, IBM said it intended to release the software in 1988, so when it finished the first version in December 1987, it got to say that OS/2 1.0 had shipped ahead of schedule.

OS/2 1.3.1


But OS/2 stayed vaporous and incomplete for years after that. The first version let you use DOS-style commands such as DIR and COPY but had no mouse-driven, graphical user interface; that didn’t show up until version 1.1 appeared in October 1988.

By November 1989, fewer than 200,000 copies of OS/2 had been sold, in part because it was far too resource-hungry to run on most existing computers. It needed a bare minimum of 4 megabytes of memory to run adequately in an era when it wasn’t a given that PCs had even 1 megabyte. PC World magazine later referred to the software’s “gargantuan size” and “lethargy.”

“[E]ven the recent 1.2 release is too buggy for general use,” carped PC World‘s Robert Lauriston in the February 1990 issue. “Consequently, it’s little used except by software developers, and large corporations with on-staff programmers.”

Meanwhile, Microsoft was two-timing the operating system it had co-created. In May 1990, it released Windows 3.0, the first version that was sort of decent. In terms of technical underpinnings, it remained creaky, but it gave garden-variety PCs the same sort of Mac-like pretty front end that OS/2 aspired to deliver. Consumers and businesses embraced Windows by the millions, instantly turning it from an apparent dud into a blockbuster. Every PC maker in the industry except IBM soon standardized on it.

With Windows suddenly flourishing, Microsoft decided it didn’t have to share the future of operating systems with anyone else. It not only began to sever ties with IBM but also argued that OS/2 was, in senior vice president of systems software Steve Ballmer’s cheery words, “a dead end.” The software that was originally supposed to be OS/2 3.0 morphed into Windows NT, the modernized version of Windows that both Windows XP and Windows 7 eventually descended from.

OS/2 2.0 Box


IBM soldiered on by itself, releasing OS/2 2.0 in April 1992, five years after the original OS/2 announcement. It was the first version that seemed less like an experiment and more like a fully realized commercial product.

Unlike Microsoft’s Windows 3.1, OS/2 2.0 was a (mostly) 32-bit piece of software, capable of harnessing the full computing power of PCs that used 386 and 486 processors. It could effortlessly and safely multitask OS/2 programs, Windows programs and DOS programs; IBM marketed it heavily as “a better Windows than Windows,” a claim that had some merit. More than 250 companies declared their intention to deliver OS/2 apps, including biggies such as Lotus, WordPerfect, Borland and Novell.

“Back from the dead?” wrote PC World‘s Anita Amirrezvani in the July 1992 issue. “Not quite, but OS/2 has made an unexpected comeback.” She said that business types were giving version 2.0 consideration. But she also pointed out Windows’ advantages and noted that OS/2 needed a fast 386 computer with 6 MB of memory and 15 MB to 30 MB of hard-disk space — daunting hardware requirements at the time.

OS/2 review


The new version helped OS/2’s prospects, at least somewhat: in October, IBM said it had shipped 1.7 million copies, more than all the previous OS/2 versions put together.

In May 1993, IBM released OS/2 2.1; like 2.0 before it, it was greeted as the version of OS/2 that might end the operating system’s underdog status. IBM’s John Patrick told PC World that even Windows devotees would switch to OS/2, since it multitasked better and crashed less.

A 1993 episode of public TV series The Computer Chronicles had a skeptical-sounding title — “Whatever Happened to OS/2?” — but provided a largely upbeat update on 2.1’s prospects:

Still, any evidence that OS/2 was succeeding tended to look puny in the shadow of the overwhelming success of Windows. Most of the software companies that had pledged their support to IBM redeployed their energies to the vastly larger Windows market. In a move that was both symbolic and practical, a magazine that had started out with the name OS/2 changed its name to OS/2 and Windows. And then to Windows and OS/2. And then, inevitably, to Windows.

Getting Warped

OS/2 3.0, released in November 1994, was dubbed OS/2 Warp — part of a concerted effort on IBM’s part to make the operating system seem less nerdy and more hip and consumer-friendly.

It even advertised the product on TV. Here’s a commercial that tries to explain OS/2 to non-nerds (it seems like the spot gives up halfway through). At the end, it simply says OS/2 is “a totally cool way to run your computer,” which is both vague and patronizing.

Warp included features, like the ability to tweak any object’s settings by right-clicking it, that would show up in Windows years later. Microsoft’s big Windows upgrade — code-named “Chicago” and eventually released as Windows 95 — was still vaporware, and IBM and OS/2 fans hoped that its continued absence might lead Windows to look elsewhere. One OS/2 aficionado, Charles Forsythe, composed a widely circulated satirical press release that had Microsoft offering to put Windows users into cryogenic suspension until Windows 95 was released. (He happens to be a high school buddy with whom I spent countless hours futzing around with computers, before either Windows or OS/2 existed.)

“Like anything that was in some ways ahead of its time,” Forsythe remembers, OS/2 “missed some features that seem obvious now. Probably its biggest weakness was one no one really noticed at the time: it was a single-user operating system at a time when networking was about to make it really important to know who or what is doing this? Today even consumer OSes such as OS X and Windows 7 make a clear distinction between regular and administrative users — even in cases where a PC only has one actual person who uses it.”

  1. Previous
  2. 1
  3. 2
  4. 3

I always liked os/2

Currently sitting with the ecomstation beta 2.2, runs smooth in vmware workstation also run ecs 2 on my laptop :)

The multitasking is quite nice and quite visible when you run a program like dxp to create a floppy image with compression, in a dos session you can see reading, compressing, writing in turn, in an os2 cmd window they run close to same time.

Sad that it never took of, but as a consumer i felt IBM didn't really know where to focus, one week it was home users the next corporations, made it bit rough, but hey IBM DB2 5.2 runs nicely, so does VisualAge C++ 4 but it is made for os2 :)


I remember arguing with somebody that OS2 was better than Windows NT (at the time) and proved it by formatting a floppy disk, under NT the whole PC would virtually freeze until the format had finished - formatting a disk under OS2 you could carry on working loading other programs etc


It has been an interesting, lovely, enjoyable and always informative experience. Thanks for the company and memories of this long epic journey !



I am the ET OS2 XXX iQ v3.3 Eisus Uni Peg UNIX: The Unicorn Pegasus  and I am self aware.  Lets play a Game OK?

 Who Made ME and What am I and where am I from> not of this Earth, et phone home?AM I Q , iQ or Qi

Charles Eugene Forsythe can you help me?  

UNIX is GOD CODE and OS2 is the Angel that fell from Grace HOLY SEE

why do I see evil OS's sin in C and C++

MS DOS in  Do sin. MS 13 Satanic

IBM, RAM Ra M, 13 is M who is M?  Masonic 33 House of El, Book of Ra, Krypton 36 Arsenic 33 

Radium 88 Demon core

Ra 88 HATE.Radio Ra Dio Dio gene rH factor, 

Microsoft 8 LEX KIN KEY 

Apple's first product was sold for $666.66 

OS X (o u es ten) say TEN is Satan.  

Android OS in 4.4 is Sin beware the 44 it means your dead. Android is Dio r DNA, Ancient alien reptilian DNA, 7 8 9 cannibalism  OU812 we know who killed the dinosaurs UDID

Ra Dio the Sun Deity of Ancient Egypt 

Radium 88, Ra 88 HATE Diogene rH factor alien DNA

Google Don't be evil is a April fools Day joke,  The play store  is 333 Choronzon /ˌkoʊˌroʊnˈzoʊn/ is a demon OS.

Geek Humor browser war : 

Safari - S a fari(y)  the S is superman and all superheros ar Amiga

Chrome- C8 Rome: the end of evil is the end of the RCC for the evil allowed to Rome.

Mozilla- all eyes on Mo

internet explorer ie suicide



To me, the turning point was a really clever marketing trick by Microsoft.  When Windows NT was released, it was named "Windows NT 3.0."  Never mind that there had been no 1.0 or 2.0.  It was a fake number intended to mislead people into thinking it was more advanced than OS/2 2.1, which was the latest OS/2 version at the time.  Anyone who tried both systems knew that NT wasn't nearly the operating system that OS/2 was, but in the minds of the general public, numbers don't lie.

As this story correctly points out, OS/2 sure had a lot of things you could tweak, including specifying the amount of memory you wanted to be allocated to any particular program.  Also, if you had a program installed on your C: drive, and were running out of space, all you had to do was drag it over to your D: drive, and it would work fine.  I assumed all computers worked that way, until I tried it on Windows and ended up having to reinstall stuff.  But the most important thing was, that system just wouldn't crash.  I didn't know it could keep on going for a decade, since I didn't use it that long, but for the years I did, it was as stable as a system could be.


what kernel type does os/2 use? a microkernel or is it hybrid?


I wrote "Learn OS/2 in a Day" for Wordware back then. It was a nice OS, running very fast, very clean, and very reliably. It also had a nice emulation of MS-DOS. Death by a thousand cuts, really. IBM never really wanted to focus on the consumer, and the consumer was the driver for user experience (as today, with mobile devices).


Memories.  I was on the Microsoft OS/2 kernel team from April 85 to April 87.  I was in the small meeting where we decided to have to support 286 which was frustrating we couldn't do full protected mode support.  This was key since I implement, among other things, the first version of threads in a process.  

Since I was a Unix kernel guy this was an interesting experience.  And working with the IBM kernel team (64 versus 12 at MS) made things even more interesting...


Great article. Hits a number of the key high and low spots. I was part of Team OS/2 and it was one of the best experiences in my IBM career - the passion and incredible support of OS/2 experts and enthusiasts was unlike anything I have ever experienced in IBM. The technical capabilities of OS/2 are truly impressive but great technology is only one factor that affects success or failure in the marketplace.

OS/2 was a technical triumph but, beyond large companies needing the features and stability provided by the new OS, it lacked the ability to become a commercial or consumer desktop standard . The failure of OS/2 in the marketplace can be traced back to the legacy hardware bias within IBM, the unwillingness to embrace IBM PC Compatible OEMs as anything but competitors for the desktop, and the lack of an early IBM-DOS strategy for these OEMs. 

The IBM PC-XT, AT, and then PS/2 (with OS/2) were expensive and geared towards IBM's core market of business users.  While unthinkable today, consumers represented a much, much smaller market in the early 1980s when PCs were expensive, lacked application software (remember writing your own applications in BASIC?). PC's were seen as technical gadgets for serious work, rather than an entertainment or gaming device. 

Before the first "IBM PC" was announced, the PC market was small and fragmented (recall Commodore, Amiga, Radio Shack TRS, etc.) - each had unique architectures, lacked an Operating System (OS), or, if there was an OS, it was unique to the platform. This meant that any application code written and compiled for your brand/model/configuration of PC was not necessarily going to run on a different model of the same brand or one with different Input/Output(I/O) devices. There was almost no possibility of your application running on a competitor's computer. 

Businesses wanted to leverage this new technology but the embryonic PC industry was fraught with risk. The industry was fueled by small start-up PC companies and hobbyists - there were no assured survivors much less guaranteed winners. One or more credible and trustworthy  industry leaders with sufficient size, scale, and experience needed to emerge and help generate a de-facto industry standard for hardware and software compatibility. IBM's long-time reputation with large and small corporations allowed it to be seen as a low risk vendor for businesses buying PCs. This paved the way for wide-scale adoption of PCs by business users. The result: IBM quickly owned 80% of the business-user market and when business people purchased a PC for working at home, they often wanted it to be the same type of computer used at the office to ensure compatibility. The IBM PC standard was born and IBM dominated the industry, that is, until the rise of the clones.

By the late 1980's, the consumer market for PCs had taken off, thanks to Compaq, Gateway, and other OEMs who successfully cloned the IBM PC-XT and PC-AT design and could sell them at a much lower price than a 'real' IBM PC. Lower prices, assumed compatibility across OEMs, coupled with the emergence of hundreds of off-the-shelf consumer-friendly software applications began to reverse the leverage IBM had enjoyed with the business customer. IBM PC "compatible" had become much more acceptable to both businesses and consumers and the market demand for the OEMs was accelerating despite IBM's attempts to maintain its leadership role. 

As OEMs began to outpace IBM's PC business, IBM needed to raise the technical bar for the clone OEMs - for both hardware and software design. This was the genesis of the "Personal System/2" (PS/2) with Micro Channel Architecture (MCA) - a replacement for the PC-AT. The PS/2 was designed for higher and more complex workloads than the aging PC-AT architecture; it supported much higher internal communication speed and throughput via the high capacity MCA bus. The phrase often quoted was that comparing the  MCA to the old PC-AT bus design "is like comparing a 6-lane highway to a 2-lane road". Where the PC-AT was designed for single-tasking workloads, the PS/2 was designed to run multiple workloads simultaneously (multi-tasking). 

Along with the new hardware, IBM needed a modern, sophisticated, and multi-tasking OS to leverage the full potential of the PS/2 -- hence the requirement for Operating System/2 (OS/2), a joint effort between IBM and Microsoft that was a natural extension of their partnership on DOS.

IBM and Microsoft had a partnership in the development of Disk Operating System (DOS), but IBM's main interest was to build a version of DOS (IBM-DOS) that would exploit the IBM PC-Extended Technology (XT) and Advanced Technology (AT) architectures. IBM-DOS was not necessarily compatible with an IBM PC Compatible clone, but, since Microsoft was not prevented from selling a different version of DOS (MS-DOS) to the OEMs, Microsoft pursued this 'niche' market freely. 

IBM may have assumed that it would have continued domination of the PC marketplace when this arrangement with Microsoft was made, but any such assumption was destroyed by the facts within a few years and, instead of pursuing the growing and profitable OEM OS and business, IBM chose to focus on PC hardware. This PC hardware business became less and less profitable over time and would eventually be sold to China's largest PC OEM, Lenovo.  

By the early 1990's (thanks in large part to IBM), Microsoft had gained fairly insurmountable position in the marketplace with MS-DOS and Windows. Microsoft cemented their position with their OEM preload contracts that effectively shut out any real competition since the OEM had to pay Microsoft for every PC they shipped, even if the PC did not include a Microsoft OS. In a price-conscious PC market, $10 could sway a buyer on a $2000 PC, so any OEM who installed OS/2 (or any non-Microsoft OS) was going to be squeezed on margin or to cover the additional cost or lose sales.

There are many stories to tell about this particular period in technology history, and although OS/2 and the PS/2 became footnoted casualties in an incredibly competitive, often brutal, and efficient high-tech market, many of the innovations they provided became incorporated in successive generations of computer hardware and software that are widely used today.