The Original “Universal” Port

The Atari 2600’s joystick port had a history that survived for nearly two decades on a variety of systems, from the Sega Master System to the 3DO. Not that cross-compatibility is exactly perfect.

By Ernie Smith

Today in Tedium: We talk a lot about standards over this way, including what came before the standards were put into place and what came before that. Our last issue was about standards, even. But sometimes, de facto standards simply come into place, where a large number of people and organizations agree to do something a certain way, despite no formalized agreement or strategy. And one of the greatest examples of a de facto standard in computing history may be a controller port that remained in constant use on mainstream consoles and computers for two whole decades. I’m, of course, talking about the Atari joystick port, a port with a surprising amount of history behind it. Today’s Tedium talks about why this the Atari joystick port became the USB of its day, in a sense, and where that analogy falls apart. — Ernie @ Tedium

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1080px DE 9 Controller Male Connector

(Evan Amos/Wikimedia Commons)

You probably never noticed this, but physically, an Atari joystick port is just a serial port with a lightly modified design

If you’re a fan of Atari’s various consoles, you’ve probably looked at the port for the VCS (later the 2600) numerous times, taking in the distinctive soft plastic that wraps around its contours.

But if you look a little more closely at the connector, you might see something you didn’t expect to see hiding under the molded plastic: A set of female connectors that look a lot like a traditional serial port.

So, how did this happen—that this port that is so widely used by gamers got rebranded for the living room, and that design aside, it is essentially a serial port?

To answer that question, we need to go all the way back to 1952, when the adapter-designing firm Cannon Electronics first came up for its concept of the multipurpose D-subminiature connectors. These connectors are as close to a building block of technology as we are likely to get, and they were developed by a company called Cannon Electronics, which is still active today as ITT Cannon.

The firm built the technology to help connect together different types of electronics. Cannon was the right kind of company to develop such a device, as Cannon had developed the first mainstream electronics adapter, the cannon plug—also known as the M-series sound adapter—in 1923. The device had evolved repeatedly into a variety of different sizes, enabling new types of innovation. The Jazz Singer, the first talkie movie, benefited from a Cannon M-series adapter, according to a 2015 Cannon retrospective written by the interconnect division’s then-president, Neil Yeargin.

Cannon Plugs

A 1959 ad for Cannon’s D-subminiature connectors, which first found use in aviation settings. Eventually, nearly every computer would have a variant of this design. (Aviation Week/Internet Archive)

While Cannon had started in radio electronics, World War II changed the company’s focus into more technical solutions for airplanes, and by the time the early 1950s rolled around, there was a sudden need for a system of connectors that could be developed for any use case and could shrink or expand based on need.

D Sub Patent

(Google Patents)

From the patent filing for the technology, it makes clear that the d-subminiature was not meant to be a static design:

While the instant invention has been shown and de scribed herein in what is conceived to be the most practical and preferred embodiment, it is recognized that departures may be made therefrom within the scope of the invention, which is therefore not to be limited to the details disclosed herein but is to be accorded the full scope of the claims.

While ITT Cannon still makes this technology in numerous very specific forms, it did let the patent for the technology expire in 1974, a fortuitous bit of timing, as it meant that the technology was patent-free and available for anyone to use just as the personal computer and the video game console were first emerging on the market.

And use them, they did. The connector, in its various shapes was widely used in the early years of the computer revolution, arguably in some cases well past its sell-by date. When we talk about dongles, we start with the D-sub connector.

It was the de facto standard made up of de facto standards and proprietary use cases. It was the connector shape that everyone uses, so we might as well use it, too. Naturally, it made sense that when a company was looking to cut a few corners for a new, lower-end market, the solution would be to modify this connector to its essential elements.

By the time Atari had landed on the DE-9 joystick connector, the serial port was already starting to find a foothold with the Apple II, also released in 1977, as well as with Altair-style computers.

But in many ways, it was Atari’s hardware developer on the VCS, the subsidiary company Cyan Engineering, that had the inspiration that led to the design. by removing the outer framing of the port and wrapping the connectors around a thicker piece of plastic, the result was that the controller didn’t need quite the level of electromagnetic shielding that the standard port was designed to offer. It was a bit of a kludge—a way to save a few bucks in a format where it wouldn’t necessarily be life or death if the connector fell out. (After all, the thumbscrews that are a common part of D-sub connectors were also left off the Atari joystick design.)

In a lot of ways, the roots of the VCS came about out of a desire to build a modular console—one with games that could be replaced, and controllers that could be used in different games.

But little did they know, Atari had designed the controller port for seemingly the entire video game and 8-bit computer industry, and while it looked a little different from system to system, it held up in the computers and consoles where it was included for nearly two decades.

Perhaps that’s a lot to lift for one little port that became a de facto standard. The problem with de facto standards is that they’re easy to break.


The year Atari won an injunction against Commodore for its joystick design for the VIC 20, in which the cut-rate computer maker had produced a joystick design that was nearly identical to the design Atari used for the 2600 as well as its line of computers. The lawsuit was kind of funny in retrospect, because in two years, Commodore founder Jack Tramiel would quit Commodore, purchase the consumer products portion of Atari and remake the company in his image.

Atari 800 XL Joystick Ports

A close-up shot of the joystick ports on an Atari 800XL. (Multicherry/Wikimedia Commons)

The Evolution of the Atari joystick port, as seen through three consoles and three computer systems

The problem with de facto standards is that the de facto nature of it means that when others inevitably latch onto the basic idea that you’ve built, they will put their own twist on it in ways that, while they work for that specific vendor or user, break things for everyone else.

An obvious example of this is the browser wars. Netscape and Internet Explorer each made significant changes to the HTML spec for purely competitive reasons, changes that took years to roll back to a consistent place—perhaps the ultimate genie-back-in-the-bottle situation.

In many ways, the Atari joystick port is what happens when you create a connector that everyone uses, but not everyone has agreed to how it gets used. It’s USB born in chaos and out of necessity. While most of these controllers are hardware compatible with the port, meaning you can plug them in to other systems, they aren’t necessarily software-compatible, nor will they include consistent setups. In some of these consoles—particularly the 3DO—rumors abound about it actually being dangerous from an electrical standpoint to even plug some of these controllers into incompatible systems, which should tell you all you need to know about the de facto nature of the 9-pin Atari joystick port “standard.”

So, with all that in mind, I want to highlight how different consoles and computers used this system. Hilariously, this list doesn’t include a single Atari console or computer.

Commodore 64

The computer that expanded the horizons of the game port beyond just games.

The Commodore 64 wasn’t the first, nor the last computer to natively support Atari-style joysticks. (The honor of first goes to the Atari 400 and 800, of course.)

But the C64’s popularity—still the highest-selling home computer of all time, it outsold the Atari home computers by a healthy margin—did a lot to turn the port into something of a mainstream entity and expanded its potential use cases. The joystick port was used for things such as mice, light pens, and graphics tablets, helping to stretch the platform’s capabilities.

One particularly notable entrant on the joystick port front was the KoalaPad, a graphics tablet that could be controlled with a finger or stylus, effectively making it one of the first touchpads on the market, more than a decade before the technology went mainstream. The KoalaPad (featured by The 8-Bit Guy in 2016) wasn’t only used on the C64—it was available for the Apple II, IBM PC, and TRS-80, along with Atari’s 8-bit line of computers—but it ultimately found its niche with the Commodore machine.


Coleco Vision

(Fritz Saalfeld/Wikimedia Commons)

The HBO Max of Atari 2600 competitors.

While the Colecovision shared the same physical port as the Atari 2600, in its default form it was significantly more complex than the earlier system thanks to its nine-button number pad, something that was only offered as an accessory for the Atari console.

“The Coleco controller is not as unwieldy as it may look, but it’s close,” the website Gametrog stated. “It’s not very ergonomic, but when working it gets the job done.”

The Colecovision console, despite being on the market for only about two years, had a reputation as a high-quality video game console that could produce arcade-quality graphics. The success of the system extended to the controls, which included a variety of accessories that used the controller port, including a trackball, a steering wheel, and a “super action controller,” which combined many of the more complex functionalities of the Colecovision’s controls into a more handheld format.

While Atari 2600 or 7800 controllers could work with the system, they required aftermarket adapters to reach their full potential because of the difference in the number of buttons.

Commodore Amiga


This infamous game controller has a 9-pin port at the other end. (Evan Amos/Wikimedia Commons)

The computer that treated the 9-pin port like a standard.

It makes sense, given the corporate connection between Commodore and Atari as rivals who, at different times, shared an owner that the companies would share some common ground in certain areas of their computing experience.

And while the Amiga was a huge leap forward for computing technology, it leveraged the same gamepad ports of its predecessors—and unlike later systems such as the Genesis, it was essentially fully compatible with the 2600.

That wasn’t true of every model, however; the later CD32 system, an attempt by Commodore to consolize the Amiga, leveraged some slightly different control schemes internally to support additional buttons. Nonetheless, if you plugged the controller into an Atari 2600 and hit the big red button, it would work—not that you would necessarily want to, as that specific controller design frequently appears on worst controller lists.

Amstrad PC1512

A PC-compatible system that supported Atari-style joysticks … through the keyboard.

Amstrad was by no means a newbie to using Atari-compatible joystick ports, utilizing the port design on its better-known Amstrad CPC line of machines. But what makes the PC1512 an interesting discussion point in this context is the decision by the British company to largely eschew the IBM PC’s prevailing approach to input devices, meaning that its mouse would often have compatibility issues with PC apps that used it.

The joystick port was extra-bizarre in the context of the IBM, because it was essentially a 9-pin Atari joystick port that could be mapped to keyboard controls—which actually made it very flexible for most games, which had keyboard controls baked in, as the YouTube channel Retro Erik notes in a 2018 video.

Sega Genesis

The most popular console that utilized the Atari joystick port wasn’t made by Atari.

Odds are good that a huge percentage of the people who played the Sega Genesis never had an Atari system. The Genesis, when all was said and done, sold around 40 million units worldwide, according to Sega Retro, meaning that, globally, it actually outsold the 30-million-units-strong Atari 2600 by a huge margin.

Interestingly, the system maintained a backward compatibility with both the Atari system and older Sega consoles through the DE-9 connector—though, as with the Amiga, it wasn’t quite an apples-to-apples setup. Generally, a Genesis controller works well enough on a single-button Atari 2600, but all bets are off on later multi-button systems.

But what about doing it the other way—a single-button Atari joystick on a Sega Genesis? Some have tried, and let’s just say that the awkwardness speaks for itself.

3DO Interactive Multiplayer

The proprietary controller port that, if you squint right, looks like an Atari joystick port.

Now, don’t get me wrong—I know how many fans of Plumbers Don’t Wear Ties and Gex there are out there—but the 3DO had a somewhat bad controller reputation, with graphically-impressive games like Way of the Warrior getting ripped by publications of the day, like EGM, for having horrid controls.

Some of the issues with the controls came down to the console’s spec—particularly the decision to daisy-chain the controllers rather than just having a second controller port, meaning that the second player was always in danger of being physically affected by the actions of the first player.

While the physical design of the controller itself wasn’t necessarily hated, it was arguably the weakest link of the system.

“It’s what would happen if a Sega Genesis controller mated with a Super Nintendo controller,” the OG video game channel Classic Game Room recalled.

From a port standpoint, it was something of an anomaly. It largely followed the DE-9 approach of earlier consoles, but the shape of the connector was much closer to a traditional computer serial port. And unlike most controllers that utilized this design, it sent control signals in a fully digital format, meaning that it’s a bad idea to plug a Genesis controller into one of these ports. In a way, it was a bridge between the last generation of systems that relied on the Atari port and the next generation, which would be predicated on digital controls.

“Software incompatibility I can understand, but this is ridiculous. I hope consumers complain enough to make Commodore revert back to the good old joystick port. Changing to the new port is bad public relations and bad business.”

— Scott Mace, a senior writer for InfoWorld, complaining loudly about the decision by Commodore to drop the standard Atari-style ports used on the Commodore 64 and VIC-20 in favor of what were at the time called the Commodore 264 and 364; the 364 never saw release, but the 264 eventually came out as the Commodore Plus/4. There was a reasonable reason for the company to move to a proprietary DIN-style connector for the joysticks on the Plus/4, but it wasn’t properly explained to consumers, likely hastening the removal of the Plus/4 from the market. It highlights the challenges of inertia the DE-9 port fostered.

As you probably know about me, I am a stickler for port standardization these days. I want my ports to be consistent across the board where possible. That means I’m a big fan of USB-C and it drives me nuts when a company (specifically a fruit-named company that stars with the letter A) does not support it to the degree it could.

But the thing that allowed all that to happen was a decision by standards bodies to come together and agree on things. Now, to be fair, a lot of quote-unquote “standards” often emerge that don’t get any buy-in from those that are anticipated to use them.

In many ways, the fractured nature of the Atari 9-pin joystick port underlines this elegantly. This was a port people used because it was cheap and there were existing standards to pull from. The problem was, these standards led to a port that went all over the place in practice, because there was no technical reason everyone had to follow the same rules.

The structure alone is never enough when it comes to standardization. It needs to be backed by a pledge of buy-in and consistency—and the Atari joystick port is the perfect example of this.


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Ernie Smith

Your time was just wasted by Ernie Smith

Ernie Smith is the editor of Tedium, and an active internet snarker. Between his many internet side projects, he finds time to hang out with his wife Cat, who's funnier than he is.

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