Compaq Deskpro 386

Last Updated on April 28, 2022 by Dave Farquhar

The Compaq Deskpro 386, announced in September 1986, was a landmark IBM PC compatible computer. The first fully 32-bit PC based on the Intel 386, its release took the leadership of the PC ecosystem away from IBM, and Compaq became the leader.

Compaq was no upstart by 1986. Its Compaq Portable was a runaway success earlier in the decade, and Compaq was a darling of the industry. The Deskpro 386 solidified Compaq’s position as an industry innovator.

Compaq Deskpro 386
By releasing the 32-bit Compaq Deskpro 386 in 1986, Compaq seized leadership of the PC market from IBM. IBM never recovered.

The Compaq Deskpro 386 wasn’t as revolutionary as it sounded, but it didn’t need to be. Software that would have felt its weaknesses was still years away. It was basically a 286 clone with enough changes to make a 386 CPU work. It originally came with a 16 MHz 80386 processor. Speed-wise, it was about three times as fast as a 6 MHz 286-based IBM PC/AT, and twice as fast as the fastest available 286 systems of the time.

Intel released the 386 processor in October 1985. It was available in volume by June 1986.

Compaq wasn’t shy about predicting the machine’s significance. At introduction, if IBM didn’t release a 386-based machine within six months, Compaq president Rod Canion predicted, the Deskpro 386 would become the industry standard. It took seven months for IBM to respond with its PS/2 Model 80, and the Deskpro 386 did indeed become the standard.

Compaq Deskpro 386 Pricing

The base price was $6,499 for a system with 1 MB of RAM, MS-DOS 3.1, a single 1.2 MB floppy drive, and a 40 MB hard drive with a 30-ms seek time. The price didn’t include a monitor or video card. A basic CGA/monochrome video card was $199 and an EGA card was $599. A color monitor was $799. By the time you added the video card and a monitor, a complete system cost almost $8,000. In 2017 dollars, that would be nearly $18,000.

This was expensive for the time, but it only represented a 23 percent premium over an IBM PC/AT even though it was twice as fast as a PC/AT. Reviewers in 1986 acknowledged the high price but argued that the performance offered good value, if you needed the performance.

Compaq Deskpro 386 Specifications

Compaq Deskpro 386
Intel started shipping 386 CPUs in volume in June 1986. Compaq used the new chips to build a workstation-class PC, forcing IBM’s hand and taking leadership of the PC industry.

The Compaq Deskpro 386 had a 32-bit expansion slot for RAM (it could use up to 14 megabytes), four 16-bit slots and three 8-bit slots. All but the 32-bit slot were ISA. The Deskpro 386 came with a 32-bit memory board with 1 megabyte of RAM from the factory. Five of the slots were open for user expansion.

The presence of 8- and 16-bit slots slowed the system down, but true 32-bit operating systems were still a few years off. It was essentially a fast-for-its-time 16-bit system.

The Deskpro 386 had a math coprocessor socket for an Intel 80287 chip running at 8 MHz. That wasn’t a mistake; the 387 wasn’t available yet. A slow 287 floating point unit was faster than none at all. Once the Intel 80387 hit the market, Compaq revised the design to allow either a 287 or 387 math coprocessor.

The machine had a total of four 5.25-inch storage bays, any of which could hold a 5.25-inch floppy drive, 40-megabyte tape backup, or hard drive. Factory configurations usually included a 1.2-megabyte 5.25-inch floppy drive, and a hard drive of 40, 70, or 130 megabytes.

The Compaq Deskpro 386’s Legacy

The Compaq Deskpro 386 forced IBM to release a 386-based PC. IBM resisted 386 PCs because they would have competed with the IBM 4300-series minicomputers. IBM had a policy of not competing with itself.

Compaq exploited this in its advertising, positioning the Deskpro 386 as an alternative to workstations and minicomputers, touting its similar performance along with the ability to run industry-standard DOS software like Lotus 1-2-3. IBM saw the 386 as a conflict of interest. But for Compaq, building the fastest and most powerful PC possible with 1986 technology was an opportunity. Compaq bet, correctly, that a PC with enough power to compete with professional workstations and backward compatibility with MS-DOS would gain popularity. Compaq predicted in the Deskpro 386 user manual that high-end software previously impractical on PCs would soon follow. It was correct. In 1987, SCO produced XENIX 386, a port of System V Unix that could run on systems like the Deskpro 386, allowing it to function as a high-end Unix workstation or server.

Ultimately, the Compaq Deskpro 386 gave Microsoft and Intel the opening they needed to move from the desktop into midrange and high-performance computing. Compaq had a good run, but an ill-timed acquisition did the company in soon after the turn of the century.


Several competitors offered 386-based computers of their own within months of the Deskpro 386’s release. But being first had its benefits. One early customer was Microsoft. Microsoft developers used Deskpro 386s because they were the fastest PCs on the market. As a result, late 1980s and early 1990s Microsoft products like Windows 3.0 ran very well on Compaq hardware. So if you wanted to run Windows, it was a good idea to buy a Compaq.

IBM followed in 1987 with its PS/2 line, which featured a proprietary and uncloneable expansion bus called Microchannel. Compaq responded by working with other clone makers to develop an open competing standard called EISA. EISA wasn’t as good as Microchannel, but price won over capability.  EISA and future open standards like VESA and PCI did win, and eventually even IBM came back.

Collecting the Compaq Deskpro 386

Early 386 machines are highly collectible. They don’t turn up very often, and historically they are very important. They didn’t sell in huge quantities due to their high cost, and many were decommissioned and recycled due to Y2K, whether the systems actually had Y2K issues or not. Many IT people used Y2K as an excuse to dispose of aging systems.

Prior to the 386, proprietary Unix workstations and minicomputers dominated high-end computing. The availability of viable 386 computers made Linux and Windows NT feasible. High-flying names like Digital Equipment Corporation, Sun Microsystems, and even IBM faded over time as a direct result of the 386. The Deskpro 386 was the first of that wave. The modern PC workstation is the spiritual descendant of the Compaq Deskpro 386.

With some luck, you may be able to spot a Deskpro 386 or related paraphernalia on Ebay.

Later Compaqs elicit mixed feelings from hobbyists today, but the Deskpro 386 is a classic. I never hear anyone complain about that model, because of its historical significance.

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3 thoughts on “Compaq Deskpro 386

    • June 7, 2017 at 7:08 pm

      Yes indeed. Opposite of Tramiel in nearly every possible way.

  • June 18, 2018 at 4:43 am

    Good to see an article about the DeskPro 386, because it is just as important as the original IBM PC and the original Compaq Portable. It guaranteed that the PC ISA environment would remain open as it evolved into the fully general-purpose 32-bit (and later 64-bit) x86 architecture. It broke IBM’s attempt to regain control, and allowed the PC industry to continue its explosive growth. It took about seven years, however, for software to become fully capable of exploiting it (Windows NT and Linux). Sun made a huge error in not adopting the ISA architecture for its 386i in 1988, because its SunOS software would, with more refinement, have become the standard instead of Microsoft Windows. The 386i was canned after a year, and Sun went off into the smaller but high profit margin technical workstation and server market with SPARC and Solaris. Which was unfortunate, because Sun were years ahead of Microsoft, and computing would have been much more advanced today if everyone were on a Unix-based OS today. And let’s not forget, SunOS ran MS-DOS software very well, too, in multiple windows! Stock brokers loved the 386i.

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