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Atari CX40 joystick
Atari CX40 joystick
Atari CX40 joystick
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The Atari CX40 joystick with one button and an 8-directional stick

The Atari CX40 joystick was the first widely used cross-platform game controller. The original CX10 was released with the Atari Video Computer System (later renamed the Atari 2600) in 1977 and became the primary input device for most games on the platform. The CX10 was replaced after a year by the simpler and less expensive CX40. The addition of the Atari joystick port to other platforms cemented its popularity. It was the standard for the Atari 8-bit computers and was compatible with the VIC-20, Commodore 64, Commodore 128, MSX, and later the Atari ST and Amiga. Third-party adapters allowed it to be used on other systems, such as the Apple II, Commodore 16, TI-99/4A, and the ZX Spectrum.

The CX40 was so popular during its run that it became as iconic to Atari as the company's "Fuji" logo;[1] it remains a common staple in video game iconography to this day,[2] and is commonly referred to as the symbol of 1980s video game system design.[3] The CX40 has been called "the pinnacle of home entertainment controllers in its day",[4] and remains a staple of industrial design discussions.[5] The CX40 had several well-known problems and was subject to eventual mechanical breakdown. A number of more robust third-party alternatives were available in a thriving market, but generally at much higher prices.[6][a]

The Atari-style joystick declined in popularity as games relied on multiple buttons for gameplay. Systems from the third generation of video game consoles, such as the Nintendo Entertainment System and Master System included two action buttons on their controllers (with the NES controller also including two menu buttons). Atari's own Atari 7800 shipped with two-button controllers as well.[8]

Description

[edit]
An exploded view of the Atari CX40 joystick shows its basic construction. The top lid is not shown in this diagram.
When the stick is moved, one side of the hemisphere (right) moves down to press on the buttons while the opposite side is forced upward (left) to provide a recentering force.

The Atari joystick works by connecting the ground pin to one of several pins in the Atari joystick port, thereby dropping the voltage on that pin and creating a signal that can be noticed by a controller in the computer.[9] For this reason, Atari-style joysticks are sometimes referred to as "digital joysticks", largely to differentiate them from the analog joysticks found on systems like the Apple II and IBM PC.[10]

The main structure of the CX40 is formed from a concave moulded thermoplastic base with a separate flat lid that covers the opening on the top of the base. Four cylindrical protrusions on the inside of the base hold a printed circuit board (PCB) above the bottom, roughly centered vertically. A conical post on the base passes vertically through a hole in the middle of the PCB.[11]

The PCB has five membrane switches mounted on top. Four of the switches are arranged in a cross pattern around the hole in the middle of the PCB; the fifth is offset near one of the corners. The PCB connects the switches to pins in the 9-pin D-connector that leads to the console via a cutout in the upper right corner of the base. The cutout is shaped to grip a moulded strain relief on the cable.[11]

The stick itself is a moulded polypropylene form consisting of a hollow vertical cylinder with a hemispherical dome at one end. The stick is placed on top of the conical post in the base, and the lid is placed over it. This clamps the stick between the post and the circular cutout in the lid. When pressure is applied to move the stick, it can rotate on the post by sliding the hemisphere within the circular cutout.[11]

The hemisphere has four small "fingers" at the bottom, which are positioned to lie over the switches on the PCB. Cutouts in the hemisphere make the fingers mechanically separate from the main section of the stick, allowing them to flex so they do not press too hard on the switches. When the stick is moved, the hemisphere rotates on its support post, bringing the fingers down to press on the appropriate buttons. At the same time, the opposite side of the hemisphere rises, where it comes into contact with short protrusions on the lid. These push down on the flexible section of the hemisphere, providing a centering force that returns the stick to the upright position when pressure is released.[11]

The stick is assembled by placing the PCB within the lower case and routing the cable out of the box. The stick is then placed on top of the post, and a flexible rubbery cover is placed over the stick. A red plastic button is placed over the fifth switch, providing the fire button; and the top lid is then placed on top of the entire assembly. Four machine screws inserted from the bottom of the case through the PCB support protrusions hold the lid on, holding everything in place through compression.[11]

Although the stick can be pressed in any direction, the four fingers on the hemisphere allow only two switches to be pressed at a time. This allows a total of eight directions: four for up, down, left, and right, and four more for combinations of neighboring switches: up-left, up-right, down-left, and down-right. The physical movement on the post prevents non-neighbouring switches from being pressed; one can not press up and down at the same time, for instance.[11]

The base and its cover are moulded with some roughness in the plastic. The portion directly around the stick and the fire button are smooth. Just around the opening for the stick are a series of rectangular embossings with the four cardinal directions indicated by small wedge shapes. The 12 o'clock position replaces the wedges with the word "TOP". These markings are all painted orange, but this tends to wear off over time.[11]

Problems

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Right-handed users would normally hold the stick in their left hand by gripping the left side of the case with their thumb over the fire button, and fingers wrapped around the left side and bottom, while their right hand operated the stick. Some games allowed the stick to be rotated for left-handed users, or this could be done with some minor re-wiring.[12]

The ergonomics of the base and the need to hold it while pressing the fire button led to fatigue of the left thumb that became known as "joystick thumb".[13] This was especially common in games that required the user to fire repeatedly or hold down the button for long periods, like Eastern Front (1941). This led to various "autofire" attachments, available as do-it-yourself plans,[14] pre-assembled, or as parts of 3rd party sticks. These simulated rapid presses of the fire button as long as the button on the stick was held down.[13]

Small rubbery pads on the bottom allowed for stick placement on a desktop. However, the torque needed to operate the internal switches was more than enough to flip over the lightweight stick. Some 3rd party replacements used a much larger base and/or a shorter vertical stick so the torque was reduced. Generally those with bases large enough for one-handed use tended to be too large to use two-handed. Modifications using suction cups, also found on some 3rd party sticks, were generally regarded as more trouble than they were worth.[13]

The CX40 was infamous for its eventual breakdown from one of two problems. One was that the control ring on the bottom of the stick moulding was not very robust, and either the ring itself or the four small tabs that connected it to the stick could be broken by applying too much force. The ring transmitted the force from the stick to the switches, so if it broke, the stick would no longer operate properly in that direction. This happened with "distressing regularity".[6] The other problem was that the switches themselves would eventually wear out due to repeated use, normally with the top membrane cracking or the tape holding it in place wearing off.[15][16]

A common modification was to replace the switches with miniature snap-action switches (microswitches). Some of these, however, have the problem that their actuation is non-linear; they require considerable force to start moving compared to the force needed to complete the motion. When used in an otherwise unmodified CX40, this caused it to be more difficult to move along the diagonals,[13] as one of the two switches being pushed would normally reach the threshold first, causing motion in that direction while the other was not yet pressed. In games that required fine control, like Jumpman, these solutions were generally unsuitable. Newer switches improve this action.[17]

Versions

[edit]

CX10

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CX10 joystick

The original CX10 version was designed by Steve Bristow for the 2600[18] and produced only for a single year. Many of these[b] had the word "ATARI" printed in white letters on a thin metal plate at the very top of the stick.[19]

Internally, the CX10 differed from the CX40 primarily in the switch mechanisms. In the CX10, a thin plastic plate was placed directly on top of the PCB, separated by a few millimetres. Cup-shaped protrusions on the top surface held a small metal spring, and opposite these on the bottom surface of the plate was a small metal bar. The plate was positioned so the bars on the bottom of the cups were positioned over similar bars on the PCB, although aligned perpendicularly. Slits cut into the plate on either side of the cup made that section of the plate flexible. When the stick was moved, it pressed on the spring, eventually providing enough force to bend that section of the plate down until the two metal bars made contact. The springs provided the recentering force.[18] This operation required more physical motion to depress the switches than on the CX40, and the CX10 is generally considered to be less suitable for gaming.[1]

CX40

[edit]
The CX40 for the Atari XE series computer used a matching grey colour instead of the standard black.

The CX40 was designed by James Asher[11] to replace the CX10, with the aim of greatly improving its ability to be inexpensively mass-produced.[1] By 1983, one out of every five American homes had one.[20] This model accounts for the vast majority of Atari's production run.

The CX40 is nearly identical to the CX10 externally, but lacks the printing on the top of the stick, and replaced the uppermost wedge in the ring of embossing with the word "TOP". By 1986 the market had been so flooded with 3rd party clones (see below) that the CX40 was difficult to obtain, and some dealers could only order it with software.[21]

A new CX40 using gray colored plastic for the base was released with the Atari XEGS computer. It also dispensed with the orange paint on the embossing on the base. It was otherwise identical to the earlier CX40, retaining the black plastic cover on the stick and the red fire button.[1]

Other joysticks from Atari

[edit]

The CX40 remained popular throughout the run of the 2600 and Atari 8-bit computers, but by the end of their run many 3rd party improvements had appeared and Atari introduced new controllers of their own.

Released in the summer of 1983, the CX842 "Remote Control Wireless Joystick" was a rebranded version of the Cynex Game Mate 2. These were essentially CX40's on top of a radio device, so the bases were quite large as a result. A separate receiver box completes the connection to the console.[22]

Atari also advertised the CX43 "Space Age Joystick", the most radical change to the basic concept. This was essentially a very small version of the CX40 mounted on top of a trigger-style handle with a fire button on the front. The handle was intended to be held in one hand while the other operated the very short stick on top. The CX43 may be a rebranded version of the Milton Bradley HD2000, which was never released.[23]

The Atari 7800's CX-24 Pro-Line joystick was designed to be backward compatible with the 2600 and its games. The Pro-Line was originally advertised specifically for the 2600 in 1983,[24] but was not released until it was made the pack-in controller for the 7800. Its right fire button was designed to switch between functioning as a discrete button for 7800 games, and as a duplicate of the left fire button (which was functionally identical to the CX-40's lone fire button) for 2600 games. The Atari CX-78 Joypad, available in PAL markets in place of the CX-24, had the same compatibility as the Pro-Line stick.

3rd party alternatives

[edit]
The Commodore VC1311 was introduced after their clone of the CX40 was ordered off the market.

The CX40 was the only model in widespread use until about 1981, when the introduction of Space Invaders on the 2600 quadrupled that platform's sales.[25] This led to a thriving 3rd party market for better sticks for use on the 2600.[26]

Many were almost identical copies of the CX40. Other examples of barely-modified sticks include the Gemini GemStick, which was essentially a CX40 with a somewhat larger base and the fire button replaced by a larger yellow version. The Gemstick 2 added a second button in the upper right. The Suncom Slik-Stik was slightly more modified with the case rounded off and a large red plastic ball at the tip of a shortened stick. The shorter stick made it more suitable for single-handed use. Suncom later introduced the TAC-2, essentially a larger Slik-Stik with buttons on both sides, for left-handed users.[27]

Commodore's CX40 clone (right) next to a CX40 (middle)

For the VIC-20, Commodore International introduced a joystick that was essentially identical to the Atari model with the exception that the top plate on the base was white instead of black. This prompted Atari to sue for patent violations.[28][29] Commodore responded by introducing the 1311, a modified version that made the case more rectangular, changed the stick from a tapered hexagonal prism to a triangular prism, and replaced the single round fire button with a larger one running across the top of the stick, making it suitable for use in either hand. These changes also rendered it painful to use and it was widely panned.[30][31]

Happ's Competition Pro used micro and leaf switches in place of Atari's membrane switches. The red stick presses on the white and blue switch actuators. The fire buttons are activated by long leaf contacts.

The Wico Command Control was one of the earliest examples of a stick that differed radically from the Atari pattern in mechanical terms. Wico was a major supplier of arcade game joysticks and adapted these mechanisms for home use.[13] These replaced the membrane switches with leaf switches that were much more robust and provided the recentering force internally. A large rounded-corner square block of plastic provided the moving surface similar to the hemisphere in the CX40, but was shaped to provide more obvious directions when pressed, sliding along the edges of the square. The stick, a steel tube covered in a bat-like red plastic moulding, featured a button on top that pressed a shaft running through the center of the stick to another switch below the main assembly.[32]

The base was greatly enlarged with the specific intent of making it useful in one-handed play, which operated in concert with the stick-top button. A switch on the base selected whether the button on the handle or the base was active. The case also featured moulded indents in the bottom that made it easier to hold in two-hand use. The result was a system that was significantly more robust than the Atari sticks, but also much more complex and expensive. Later versions added a switch for "autofire" that caused the fire button to be repeatedly pressed while held down, and even later the bat-like handle was replaced by a ball like those found on arcade sticks. A flightstick-style handle with finger grooves was also offered. It was consistently rated very highly.[6][27]

The Epyx 500XJ was a radical restyling of the basic CX40 concept. This version, for the NES, has additional buttons.

The Epyx 500XJ[c] was among a very few designs that broke from the Atari mould completely. Like the Competition Pro, the 500XJ's mechanism was based around a steel shaft pressing on microswitches and offered a similar feel. Unlike the Command Control, the 500XJ's shaft pressed directly on the switches, making it harder to press into the diagonals. More importantly, the base of the unit was completely changed, consisting of a moulded form that was designed to be easily gripped by the left hand with the index finger naturally positioned over a fire button located on the bottom right side of the case. Both robust and unique, the 500XJ garnered widespread praise and was the only other joystick of the era to achieve widespread popularity to the point of becoming a standard of sorts.[33][failed verification]

Early gamepads were essentially CX40s with the base exposed to the user and the joystick on top removed. Sega's Master System and Genesis/Mega Drive controllers are compatible with the 2600, although the console can only read one fire button on the Sega controllers – the 2 button on Master System controllers, and the B button on Genesis controllers. The Sega Control Stick[34] was the only Sega-made controller actually marketed for its compatibility with Atari and Commodore systems. Due to the unique setup of the 7800's fire buttons, Sega controllers are not compatible with 7800 games that require two fire buttons, although they can be used with 7800 games that only use one fire button.

Atari joysticks on other platforms

[edit]

The Atari joystick was so popular that adaptors for its standard of connector were available for platforms like the Apple II and IBM PC.[35][20] There were even factory modified CX40s, notably the Trisstick from Big Five Software, that placed the converter electronics inside the CX40 case and replaced the cable with one suitable for the TRS-80.[36]

While its single-button configuration makes it unsuitable for general use with Sega's consoles, an Atari joystick can be used in the player two port for certain two-player games with minimal controls, so long as a standard Sega controller is plugged into the player one port. For example, a CX-40 can be used to control Tails in two-player mode in Sonic the Hedgehog 2, as all three Genesis fire buttons are mapped to the same jump/spin-dash function (and with the Master System for the 1 and 2 buttons), although player two cannot pause the game due to the absence of a Start button.

Notes

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References

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[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Atari CX40 joystick

View on Grokipedia
from Grokipedia
The Atari CX40 joystick is a digital game controller developed by Atari, Inc., featuring a single red fire button, an eight-directional movement stick with a protective rubber boot, and a 9-pin D-sub connector for interfacing with consoles. It measures approximately 5 inches in height, 4 inches in width, and 4 inches in depth, weighing 8.8 ounces, and was designed for straightforward, fatigue-inducing gameplay typical of early home video systems. Introduced around 1978 as a cost-effective successor to the original CX10 joystick bundled with the (initially released as the Atari Video Computer System in September 1977), the CX40 quickly became the standard for 's ecosystem. Designed by James C. Asher to simplify production while preserving core functionality, it received U.S. Patent 4,349,708 in 1982 (filed in 1979), which detailed its radial movement mechanism relative to an axial pivot for reliable control. By 1983, the CX40 had achieved widespread adoption, appearing in one out of every five American households alongside the . Compatible with the Atari 2600, 5200, and 7800 consoles—as well as later Atari XE computers via a gray-plastic variant—the CX40 established the 9-pin standard that influenced third-party systems and even adaptations for computers like the Apple II and IBM PC. Its simple, non-ergonomic design prioritized affordability (retailing at $9.95 individually or $10.95 per pair) over comfort, yet it defined the joystick archetype for arcade-style games like Combat and Pac-Man. The controller's legacy endures through official recreations, such as the 2023 CX40+ model, which replicates its specifications for modern Atari systems like the 2600+.

History

Development

The Atari CX10 joystick, the initial controller for the console, was designed in 1977 by engineer Steve Bristow, featuring heavy metal spring switches for directional and inputs to provide robust feedback during early testing phases. This design, detailed in U.S. Patent 4,124,787 (invented by Gerald R. Aamoth and John K. Hayashi), emphasized sequential or simultaneous switch actuation for precise control, with initial units undergoing rigorous evaluation to ensure responsiveness in home gaming scenarios. The CX10's metal switches offered high durability but contributed to elevated production costs and a longer stick travel distance, which complicated rapid directional changes in gameplay. In 1978, Atari transitioned to the CX40 model, redesigned by James Asher to address these limitations and enable cost-effective for broader consumer adoption. Asher's iteration, outlined in U.S. Patent 4,349,708, replaced the metal spring switches with conductive membrane switches, significantly reducing manufacturing expenses while maintaining compatibility with the 9-pin joystick port standard, which used digital signaling for directions and actions. This shift shortened the stick's travel for improved in home use and supported 8-directional movement through potentiometer-free digital sensing, where the stick actuated specific membrane contacts to register positions without analog components. Engineering efforts focused on overcoming production scalability issues from the CX10, such as high material costs and assembly complexity, while enhancing suitability for everyday family gaming by prioritizing affordability and port reliability over premium switch longevity. Internal Atari documentation and patents from this period highlight iterative testing to refine the CX40's mechanics, ensuring seamless integration with the 2600's hardware interface for consistent input detection across games.

Release and Adoption

The Atari CX10 joystick debuted alongside the Video Computer System (VCS), later renamed the , in September 1977 as the console's standard input device. This initial model was included with early production units but was short-lived due to challenges. In 1978, replaced the CX10 with the CX40, a redesigned version optimized for higher-volume production and cost efficiency, which became the definitive for the platform. By the early 1980s, the CX40 had contributed significantly to the 2600's market dominance, with the console reaching approximately 25% of U.S. households by 1983 and cumulative sales exceeding 12 million units. This widespread adoption helped popularize home console gaming, transforming it from a niche into a mainstream entertainment phenomenon during of systems. The joystick's simple, reliable design played a key role in enabling accessible that drove these sales figures. The CX40 became culturally synonymous with landmark Atari 2600 titles, including the 1980 port of Space Invaders, which quadrupled console sales and marked the first home video game to exceed one million units sold. Similarly, the 1982 Pac-Man adaptation, despite its graphical simplifications, sold over 7 million copies and propelled Atari 2600 hardware sales to 5.1 million units that year alone. These games cemented the CX40's status as an iconic 1980s controller, symbolizing the era's arcade-to-home gaming transition and influencing subsequent controller designs across the industry. Initial production of the CX40 occurred at Atari's facilities in , including the final assembly plant at 1215 Borregas Avenue. As demand surged, manufacturing shifted to international locations, primarily in , to support global distribution and meet the console's explosive growth.

Design and Features

Technical Specifications

The Atari CX40 joystick employs digital input exclusively, with no analog potentiometers for position sensing. Its movement is controlled via four contact switches on a , corresponding to up, down, left, and right directions; these switches activate individually or in adjacent pairs to enable eight possible directions, including diagonals. A single fire button provides one discrete action input, implemented through a separate contact switch that grounds the signal when pressed. The connects to Atari systems using a standard 9-pin DE-9 male connector, compatible with the console's joystick port. Signals are active-low, grounding the respective pins when activated, with the console providing a 5V DC pull-up voltage for detection. The pinout is as follows:
PinFunction
1Up
2Down
3Left
4Right
6
7+5V (for paddles)
8Ground
Pins 5 and 9 are unused for joystick functions but support paddle controllers. Physically, the CX40 stands approximately 5 inches (127 mm) tall, with a square base measuring 4 inches (102 mm) on each side and weighing about 8.8 ounces (0.25 kg). The shaft pivots on a central post within a circular , permitting multidirectional deflection limited by the base's design for controlled responsiveness.

Construction and Materials

The Atari CX40 joystick features a molded base designed for durability and affordability in , housing the internal components within a concave structure secured by four Phillips-head screws. The base is typically black, providing a stable platform that connects via a DE-9 connector for interfacing with systems. The joystick stick consists of a white inner handle that pivots smoothly, enclosed by a flexible rubber to protect the mechanism and facilitate omnidirectional movement. This , made of rubber material, attaches to the base and helps maintain the stick's while preventing dust ingress. Internally, a pivot post allows movement, with the rubber providing centering force to return the stick to neutral after deflection. At the core of the assembly is a single (PCB) mounted within the base, equipped with five dome-shaped membrane switches for detecting directional inputs and the fire button. These switches utilize metal dome contacts for reliable conductivity. A control ring inside the base guides the stick's movement, with the rubber boot helping to minimize wobbling. Color variants of the CX40 were produced to match bundled systems, with the standard model featuring a black base and red fire button for broad compatibility, and a later grey base version released specifically for the Atari XEGS computer bundle.

Variants

Original Versions

The Atari CX-10 joystick, introduced in 1977 with the launch of the Atari 2600, served as the initial controller model and featured heavy springs with contact switches for directional input, providing a looser feel compared to later designs. Designed by Steve Bristow under U.S. Patent 4,124,787, it included a single red fire button and a recessed hex plate labeled "ATARI" or "SEARS," without the "TOP" marking found on successors, and was produced in limited quantities primarily during that debut year. Following the CX-10's short production run, transitioned to the CX-40 in 1978 as the standard , incorporating cost-effective membrane switches for directional controls while retaining a microswitch for the fire button to enhance . This model, designed by James C. Asher under U.S. 4,349,708, maintained the single red fire button and black plastic housing but offered improved durability through simpler construction. A variant of the CX-40 was produced specifically for the XE series computers, matching the system's while preserving compatibility. In 1983, Atari expanded its lineup with the Pro-Line series, including the CX-42 , which used technology and required 9V batteries per controller. These were essentially a rebranded version of the Cynex Game Mate 2, providing cordless operation for the without altering the standard DB9 pinout. The same year saw the release of the CX-43 , a compact Pro-Line model with a trigger-style and single fire button positioned for ergonomic play in action-oriented games. Later in the decade, the CX-24 Pro-Line debuted for the system, featuring two independent fire buttons and a metal base plate, while maintaining with ports through its standard connector. Early CX-24 units included molded text on the plate, with subsequent Hong Kong-produced versions opting for stamped lettering to streamline .

Modern Reproductions

In the , has revived the CX40 joystick through official reproductions under its modern licensing, focusing on compatibility with new hardware like the + and 7800+ consoles while maintaining with legacy systems. These updates incorporate enhanced durability and contemporary features such as wireless connectivity, addressing wear issues common in original units without altering the iconic form factor. The CX40+ wired joystick, released in November 2023 alongside the Atari 2600+ console, serves as a faithful recreation of the original design, featuring a full-size red fire button, rubberized joystick boot for smooth movement, and an orange directional ring for visual feedback. It connects via a standard DB9 cable and is engineered for longevity, with improved internal components that provide a crisper response compared to aged originals, ensuring reliable performance across extended play sessions. This model is fully compatible with both the Atari 2600+ and original Atari 2600 hardware, allowing seamless integration into classic setups. Building on the wired version, the CX40+ Wireless joystick launched in November 2024 with the Atari 7800+ console, introducing 2.4 GHz wireless connectivity for untethered gameplay up to 30 feet. It includes a DB9 receiver adapter for direct connection to original Atari 2600 and 7800 systems, a USB-A adapter for use with modern PCs, supporting both left- and right-handed orientations. Powered by a rechargeable battery offering an average of 30 hours of use per charge—with a 40-minute recharge time via USB-C—this model retains the authentic red fire button and flexible boot while eliminating cable constraints. Special editions of the CX40+ , such as the 2024 Pac-Man Ghost Edition themed around the character Clyde, feature an orange color scheme inspired by the game's ghosts, complete with collectible artwork while preserving the original dimensions and modern internals like the wireless adapters and extended battery life. These licensed variants, produced by in collaboration with partners like (formerly ), undergo compatibility testing to ensure functionality with emulation software and FPGA recreations like , broadening their appeal to retro enthusiasts.

Compatibility

Atari Systems

The Atari CX40 joystick served as the primary controller for the Atari 2600 video game console, released in 1977 and produced until 1992. It was bundled with the system and essential for navigation and action in titles such as Combat, the pack-in game that demonstrated basic tank and airplane battles, and Asteroids, where players maneuvered a spaceship to destroy debris and aliens. The CX40 connected via a standard 9-pin D-sub port, providing digital directional control and a single fire button, which aligned perfectly with the 2600's simple input requirements for over 500 compatible games. The CX40 was not natively compatible with the console, released in 1982, which used analog controllers with potentiometers for proportional movement. While third-party adapters or modifications can enable limited digital operation, the CX40's digital design does not fully support the 5200's analog input needs. The CX40 was fully compatible with the Atari 8-bit family of computers, including the Atari 400 and 800 models introduced in 1979, as well as the later XL and XE series through the 1980s. These systems featured built-in joystick ports that natively supported the CX40 for both gaming and certain productivity applications, such as drawing programs or that utilized joystick input for cursor control or simulations. A gray variant, known as the CX40 "XE," was produced to match the aesthetics of the XE line, ensuring seamless integration without hardware modifications. For the console, launched in 1986, the CX40 maintained , allowing it to function with 2600-mode games on the system despite the introduction of the CX24 Pro-Line joystick variant designed specifically for the 7800's enhanced features, including dual fire buttons. The CX24 was engineered to emulate the single-button CX40 when playing legacy 2600 titles, preserving input consistency across Atari's console lineup. This compatibility extended the CX40's utility to the 7800's library of over 50 games, many of which could operate in either mode. Later Atari systems like the XEGS, released in 1987 as a hybrid computer-console, included the gray CX40 in its standard bundle, leveraging the same 8-bit architecture for full native support in both gaming and expanded keyboard-based operations.

Other Platforms

The Atari CX40 demonstrates direct compatibility with the Commodore VIC-20, released in 1981, owing to the identical DE-9 connector and pinout shared between the two systems, enabling plug-and-play functionality for directional and fire button inputs. It also provides full compatibility with the Commodore 64 and 128 models, where the DE-9 port allows basic operation with the same digital signals, though some users report intermittent hardware issues with direction detection in certain configurations. On computers introduced in the early 1980s, the CX40 operates effectively with simple plug-in connection to the 9-pin general-purpose ports, delivering full digital directional control but restricted to its single fire button, as MSX systems support up to two buttons on compatible controllers. Similarly, for the launched in 1985, the CX40 interfaces via the standard 9-pin joystick ports with direct compatibility due to the shared pinout. The Atari ST, also debuted in 1985, offers seamless native support for the CX40 through its built-in DE-9 joystick ports, which adhere to the established Atari standard without necessitating any hardware modifications. In modern emulation environments, such as FPGA recreations like platform, the CX40 is adapted using USB-to-DE-9 converters that emulate the original digital signals, preserving the joystick's responsive feel across emulated non-Atari cores while connecting via standard USB ports. These adapters, often featuring low-latency designs, facilitate the CX40's use in recreating computing experiences on contemporary hardware.

Issues and Solutions

Common Problems

The Atari CX40 joystick's design often led to thumb fatigue during extended gameplay sessions, primarily due to its stiff stick resistance and limited rotation arc, which required users to apply constant pressure for precise control. The upper-left positioning of the single fire button further exacerbated this issue, causing soreness or "joystick thumb" from repetitive pressing, particularly in games demanding frequent inputs. Mechanical breakdowns were prevalent, with the internal control ring and plastic fulcrum components wearing out over time, resulting in centering failure where the stick would stick in one direction or fail to return to neutral. The printed circuit board's foil dome switches, functioning as contacts, typically degraded over time with regular use, becoming unresponsive or requiring excessive force to activate due to material fatigue and . In high-use environments, dust ingress posed a significant problem, as the rubber boot surrounding the base allowed particles to accumulate inside, accelerating switch degradation and contributing to erratic directional inputs. Over time, the boot itself would harden and crack as plasticizers evaporated from the rubber material, worsening dust entry and mechanical strain on the internal components. Electrical issues commonly manifested as intermittent fire button response, stemming from poor contact between the button's center stud and the PCB dome after prolonged thumb pressure caused the stud to deform or mushroom. These problems often necessitated basic cleaning or part replacement to restore functionality, though many users reported recurring failures without intervention.

Modifications and Repairs

Best Electronics has offered rebuild kits for the Atari CX40 joystick since the , providing components such as upgraded printed circuit boards (PCBs) with contacts, replacement handles, boots, and retaining rings to address common wear issues like degraded contacts and centering mechanisms. These kits, including options like the 5th Generation PCB and Super Handle combinations, can restore approximately 95% of original joysticks to near-new condition by replacing internal components that degrade over time. For enhanced durability, their boots and dampening springs prevent sticking and improve return-to-center functionality, extending the joystick's lifespan significantly beyond stock parts. DIY modifications commonly target switch wear by replacing the original membrane dome contacts with tactile buttons or microswitches for crisper, more reliable actuation. One popular approach involves installing mini tactile switches (such as 3x6x2.5mm models) by cutting traces on the PCB, bridging them with wire, and the switches in place, which requires basic tools like a and can be completed in under an hour. Alternatively, microswitch installations use five small switches mounted inside the base to directly activate directions and , eliminating reliance on the worn and providing mechanical feedback similar to modern controllers. Users also reinforce the stick base by applying to cracked components or sourcing 3D-printed replacements for broken dampers, while adding to the control ring enhances smooth pivoting and centering without altering the original design. Professional repair services often focus on electrical faults, performing thorough cleaning with to remove oxidation and debris from contacts. These services, available through specialized retro gaming restorers, include full disassembly, component testing, and reassembly, ensuring compatibility with original hardware while addressing issues like intermittent signals caused by aged solder joints. Since the early 2000s, AtariAge forums have served as a key resource for community-driven repair guides, detailing techniques for switch replacements and sourcing parts from vendors like Best Electronics or for hard-to-find items such as replacement cables and boots. These guides emphasize precautions, like using low-heat irons to avoid damaging the PCB, and provide step-by-step illustrations for users ranging from beginners to experienced hobbyists.

Third-Party Alternatives

Contemporary Alternatives

During the 1980s and early 1990s, several third-party manufacturers produced joysticks as direct replacements or enhancements for the CX40, targeting users and compatible 8-bit systems with features like greater durability, refined , and additional controls to address limitations in the original design. The Wico Command Control, launched in 1982, stood out for its heavy-duty build, including a shaft for precise handling and a self-centering mechanism that ensured reliable return to neutral position after input. It incorporated two fire buttons—one on the handle and one on the base—with a switch to select between them, offering improved versatility over the CX40's single-button setup while maintaining full compatibility with 9-pin ports. This construction made it particularly suited for intensive arcade-style play on and similar platforms. The Epyx 500XJ, introduced in the 1980s, prioritized user comfort through an ergonomic grip and base that fit naturally in the palm, helping to minimize hand fatigue during prolonged sessions. Featuring a fire button and auto-fire capability in some versions, it connected directly to Atari ports, providing a more adaptable digital control option for games requiring sustained precision. Its microswitch-based responsiveness contributed to its appeal as a fatigue-reducing upgrade. The Competition Pro, a European design from the 1980s, became widely adopted for its precision engineering, employing leaf switches that delivered smoother, more consistent control than potentiometer-based alternatives like the CX40. Equipped with a ball-top stick and two large fire buttons for quick access, it excelled in accuracy for and gaming, including systems, where its robust microswitch array minimized wear and enhanced directional feedback. Among other noteworthy options, the Suncom Tac-2 from emphasized responsiveness to counter the CX40's inherent stiffness, incorporating a metal shaft and adjustable tension controls for customizable feel and fluid movement. Compatible with ports, it allowed users to fine-tune resistance for better-suited handling in fast-paced titles, marking a step toward more player-centric refinements in third-party peripherals.

Modern Alternatives

In the 21st century, third-party manufacturers have developed and adapter-based controllers that emulate the CX40's directional and fire button inputs while incorporating modern features like and low-latency connectivity for retro gaming setups. The Intec Gaming Joystick, released in 2024, offers a /2.4GHz connection via a DB9 adapter, making it compatible with original and 7800 systems as well as modern PCs. It features a , four-way directional control, and a prominent action button in a durable, semi-transparent housing reminiscent of the CX40 design. Compared to the official CX40+ reproduction, the Intec model exhibits similar build quality but requires manual resyncing after idle periods, with user reports indicating no noticeable latency differences in gameplay testing. Priced at approximately $35, it provides a cost-effective upgrade over wired originals. Enthusiast communities, particularly on AtariAge forums, have popularized custom CX40 builds in the using 3D-printed cases made from durable PETG plastic, often paired with modern microswitches for improved responsiveness and longevity. These DIY projects allow compatibility with original Atari ports by integrating salvaged or aftermarket internals, such as enhanced cables and buttons, to refresh aging hardware without altering core functionality. Similarly, Retroradionics' ArcadeR employs a 9-pin Atari-standard connector with an extra-soft, pure copper cable for reduced wear, serving as a modernized base for custom modifications. For PC and Mac emulation, ongoing third-party solutions like the RetroUSB Atari RetroPort adapter convert CX40-style joysticks into USB devices, enabling plug-and-play recognition as standard gamepads without additional drivers. This facilitates CX40-like input mapping in software emulators, supporting both original Atari sticks and compatible digital controllers from Commodore or systems. Complementing these, 8BitDo's DB9 adapters, originally for , can be adapted via simple crossover cables for wireless use on modern platforms, offering low-power pairing. On FPGA platforms like , third-party options emphasize low-latency RF over the CX40's wired design, with controllers such as the 8BitDo achieving sub-10ms response times in latency benchmarks, outperforming alternatives for precise retro core emulation. These RF-based sticks maintain directional fidelity while adding ergonomic improvements, though they require compatible USB receivers for integration. In contrast to official reproductions like the CX40+, these third-party innovations prioritize versatility across emulators and freedom.

References

  1. https://www.dimensions.com/element/atari-cx40-joystick
  2. https://www.ataricompendium.com/game_library/controllers/controllers.html
  3. https://genxgrownup.com/ataris-year-one-cx-10-joystick-vs-the-atari-cx-40-why-was-it-redesigned/
  4. https://patents.google.com/patent/US4349708A/en
  5. https://atari.com/products/wireless-cx40-joystick-atari
  6. https://atari.com/products/cx40-joystick
  7. https://artsandculture.google.com/story/the-joy-of-sticks-part-1-finnish-museum-of-games/mwXxgfgYOR55fQ
  8. https://www.atarimania.com/faq-atari-400-800-xl-xe-what-accessories-kits-did-atari-make-for-their-8-bit-computers_60.html
  9. https://creepingnet.neocities.org/gaming/2600/controllers
  10. https://thedoteaters.com/?bitstory=console/the-great-video-game-crash
  11. https://thekingofgrabs.com/2021/09/21/space-invaders-atari-2600/
  12. https://microzeit.com/en-us/blogs/news/pac-man-the-success-of-the-atari-2600-vcs
  13. http://www.videogameconsolelibrary.com/art-controller.htm
  14. https://mcurrent.name/atarihistory/wci_games.html
  15. https://www.digitalgamemuseum.org/the-history-of-games-in-sunnyvale/
  16. https://learn.adafruit.com/atarifruit-2600-joystick/joystick-internals
  17. https://8blit.com/s02e02
  18. https://dansanderson.com/mega65/up-up-down-down/
  19. https://www.epanorama.net/documents/joystick/ataristick.html
  20. https://pinoutguide.com/InputCables/JoystickAtari2600_pinout.shtml
  21. https://www.best-electronics-ca.com/CX40_REBUILD%20KIT.htm
  22. https://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=4,124,787.PN.&OS=PN/4,124,787&RS=PN/4,124,787
  23. https://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=4,349,708.PN.&OS=PN/4,349,708&RS=PN/4,349,708
  24. https://www.facebook.com/1980sgamer1/posts/the-first-wireless-controller/506819145617924/
  25. https://manuals.plus/asin/B0CG7LMFKY
  26. https://www.ebgames.co.nz/product/atari/312458-atari-cx40-wireless-joystick
  27. https://atari.com/products/pac-man-cx40-joystick-orange
  28. https://collection.sciencemuseumgroup.org.uk/objects/co8094237/atari-2600-video-computer-system
  29. https://forums.atariage.com/topic/303788-questions-for-original-xegs-ownersusers/
  30. https://retrocombs.com/vic-1311-joystick
  31. https://retrocomputing.stackexchange.com/questions/4453/what-is-the-history-of-de-9-joystick-ports
  32. https://forums.atariage.com/topic/237033-atari-sticks-not-working-on-c64/
  33. https://www.ebay.com/itm/314765295125
  34. https://www.msx.org/wiki/Atari_CX40
  35. https://www.ami64.com/product-page/classic-atari-styled-joystick-for-amiga-and-c64
  36. http://nerdlypleasures.blogspot.com/2013/01/the-industry-standard-atari-style.html
  37. https://misterfpga.org/viewtopic.php?t=7404
  38. https://www.amazon.com/Joystick-Paddle-Driving-Adapter-iCode/dp/B08QGFXH8J
  39. https://www.atarimagazines.com/v7n8/joysticks.php
  40. https://www.best-electronics-ca.com/CX40%20Super%20Boot.htm
  41. https://www.best-electronics-ca.com/joystick.htm
  42. https://www.retrorgb.com/7-atari-2600-cx-40-tactile-switch-drop-in-replacement-pcb.html
  43. https://forums.atariage.com/topic/302106-how-to-replace-domes-with-tacticle-switches-on-cx40s-with-pictures/
  44. https://www.youtube.com/watch?v=1hZ5mIIXWkk
  45. https://www.reddit.com/r/Atari2600/comments/1gzpgzv/joystick_doesnt_move_right_this_piece_broke/
  46. https://www.youtube.com/watch?v=L9EHSzlZ2-Y
  47. https://forums.atariage.com/topic/305510-atari-2600-cx40-joystick-repair-guide-teardown-new-domes/
  48. https://americanhistory.si.edu/collections/object/nmah_1278400
  49. https://www.vintagecomputing.com/index.php/archives/131/retro-scan-of-the-week-epyx-500xj-joystick
  50. https://hackaday.com/2021/10/20/refining-the-greatest-joystick-of-the-1980s/
  51. https://americanhistory.si.edu/collections/nmah_1297185
  52. https://www.amazon.com/Atari-Joystick-Controller-2600-Systems-PC/dp/B0DG2DZRL5
  53. https://forums.atariage.com/topic/374061-intec-gaming-wireless-2600-controller/
  54. https://forums.atariage.com/topic/351479-fs-kit-atari-cx40-joystick-grey-shells-3d-printed/
  55. https://forums.atariage.com/topic/353343-3d-print-your-own-cx40-joystick/
  56. https://retroradionics.com/ArcadeR-9-pin-ATARI-standard-Joystick-With-new-extra-soft-and-durable-cable-p168982750
  57. https://www.retrousb.com/product/atari-retroport/26
  58. https://forums.atariage.com/topic/354573-8bitdo-db9-bluetooth-for-megadrivegenesis-to-atari-2600-crossover-cable/
  59. https://misterfpga.org/viewtopic.php?t=8485
  60. https://misteraddons.com/pages/latency
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