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Vectrex vector logo.svg
A Vectrex and its accompanying controller
ManufacturerGeneral Consumer Electronics (1982–83)
Milton Bradley Company (1983–84)
TypeHome video game console
GenerationSecond generation
Release date
  • NA: November 1982
  • EU: 1983
  • JP: 1983
MediaROM cartridge
CPUMotorola MC68A09 @ 1.5 MHz
Memory1 KB
Display9-inch cathode ray tube (CRT)
Controller inputTwo

The Vectrex is a vector display-based home video game console–the only one ever designed and released for the home market, developed by Smith Engineering. It was first released for the North America market in November 1982 and then Europe and Japan in 1983. Originally manufactured by General Consumer Electronics, it was later licensed to Milton Bradley after they acquired the company. Bandai released the system in Japan.

The Vectrex, in contrast to other video-game systems available at the time, featured an integrated monochrome CRT monitor and did not need to be hooked up to a television set as it provided its own built-in display. A detachable wired control pad was mounted at, and could be folded into, the lower base of the console. Games included translucent color sheet overlays that could be placed over the monochrome screen. A number of peripherals were produced, such as a pair of 3D goggles known as the "3D Imager" and a "light-pen" that allowed the player to draw directly on the screen. A built-in game, Mine Storm, was playable without inserting a cartridge.

The console was originally conceived by John Ross, an employee at Smith Engineering, in late 1980, as a way to clear out excess inventory of 1-inch monitors. The console became Smith's first foray into the home game market. It was at first conceived as a handheld system called the "Mini Arcade". Once the prototype was completed, it was presented to General Consumer Electronics, who agreed to manufacture the console. Strong initial sales caused General Consumer Electronics to be acquired by Milton Bradley. The Vectrex was a victim of the video game crash of 1983, and was discontinued shortly after Milton Bradley's acquisition by Hasbro.

Despite its commercial failure, the Vectrex was highly praised for its software library, unique graphical capabilities and built-in monitor; several publications lauded it as one of the best home consoles available at the time. The Vectrex was the first video game console to have a 3D-based peripheral.[1] In later years, the system gained a cult following, with many releasing homebrew software for it. A colorized handheld version of the Vectrex was conceived in the late 1980s, but was shelved due to its manufacturing cost and the success of the Nintendo Game Boy.


Games came supplied with color overlay sheets to compensate for the limitations of the screen.
Games came supplied with color overlay sheets to compensate for the limitations of the screen.

The Vectrex was conceived by John Ross of Smith Engineering in late 1980.[2] He, Mike Purvis, Tom Sloper, and Steve Marking had gone to Electro-Mavin, a surplus warehouse in Los Angeles. They found a 1-inch cathode ray tube (CRT) and wondered if a small electronic game could be made of it. A demonstration of a vector-drawing cathode ray tube display was made by connecting the deflection yoke in a standard television to the channels of a stereo amplifier fed with music program material. An auxiliary yoke was used to keep the raster television's horizontal fly-back high-voltage system running. The demo led to a system originally conceived as a handheld called the Mini Arcade but, as Smith Engineering shopped the idea around to developers, it evolved into a tabletop with nine-inch screen.[2]

The system was licensed to General Consumer Electronics in 1981. After a brief hardware and software development period, the Vectrex was unveiled on 7 June 1982 at the Summer Consumer Electronics Show in Chicago.[2] It was publicly released in November, just in time for the holidays. The launch sales were strong enough that Milton Bradley bought out General Consumer Electronics in early 1983.[2]

Milton Bradley's greater resources allowed the Vectrex to be released in parts of Europe by mid-1983 and, through a co-branding agreement with Bandai, in Japan as well.[2] However, the video game crash of 1983 turned Milton Bradley's support of the Vectrex into a costly mistake. In May 1984, Milton Bradley merged with Hasbro, and the Vectrex was discontinued a few months after. Over its lifetime, it had cost Milton Bradley tens of millions of dollars.[2]

Prior to the Vectrex's discontinuation, a successor console with a color screen had been planned.[3] After the rights reverted to Smith Engineering, the company made plans[when?] to revive the Vectrex as a handheld, but the imminent arrival of Nintendo's Game Boy put an end to those plans.[2] In the mid-1990s, Jay Smith, then head of Smith Engineering, allowed new hardware and software development on a fee- and royalty-free basis. Smith has also allowed duplication of the original Vectrex software on a not-for-profit basis to allow Vectrex owners to obtain the original titles at low cost or for free.

Technical specifications

European release Vectrex playing the built-in game Minestorm, without overlay
European release Vectrex playing the built-in game Minestorm, without overlay

Circuit board



The computer and vector generator were designed by Gerry Karr. The computer runs the game's computer code, watches the user's inputs, runs the sound generator, and controls the vector generator to make the screen drawings. The vector generator is an all-analog design using two integrators: X and Y. The computer sets the integration rates using a digital-to-analog converter. The computer controls the integration time by momentarily closing electronic analog switches within the operational-amplifier based integrator circuits. Voltage ramps are produced that the monitor uses to steer the electron beam over the face of the phosphor screen of the cathode ray tube. Another signal is generated that controls the brightness of the line.

The cathode ray tube is a Samsung model 240RB40 monochrome unit measuring 9 × 11 inches, displaying a picture of 240 mm diagonal; it is an off-the-shelf picture tube manufactured for small black/white television sets. The brightness of the CRT is controlled using a circular knob on the back of the display. A vector CRT display such as the one in the Vectrex does not require a special tube, and differs from standard raster-based television sets only in the control circuits. Rather than use sawtooth waves to direct the internal electron beam in a raster pattern, computer-controlled integrators feed linear amplifiers to drive the deflection yoke. This yoke has similar, if not identical inductances, unlike a TV deflection yoke. The yoke uses a standard TV core. The high-voltage transformer also uses a standard core and bobbin. There is special circuitry to turn off the electron beam if the vector generator stops or fails. This prevents burning of the screen's phosphors. This design is a great deal smaller than the electronics found in the free-standing, full-sized Asteroids.

During development, for a short period of time, the possibility of using the 6502 processor was considered, but later its performance was considered insufficient.[4]

Early units have a very audible "buzzing" from the built-in speaker that reacts to the graphics generated on screen. This is due to improper production grounding of signal lines of the low-level audio circuitry, and was eventually resolved in later production models. A "ground loop" had been created by a grounding strap added in production to meet U.S. Federal Communications Commission signal radiation requirements.[citation needed] This idiosyncrasy has become a familiar characteristic of the machine.


The 3-D Imager, invented by John Ross, turns the 2-D black-and-white images drawn by the Vectrex into a color 3-D experience.[5][6] The imager works by spinning a disk in front of the viewer's eyes. The disk is black for 180 degrees and in some cases has 60 degree wedges of transparent red, green, and blue filters. The user looks through this to the Vectrex screen. The Vectrex synchronizes the rotation of the disk to the software frame rate as it draws 6 screens: with the right eye covered: the left eye red image, then green, and then the blue image is drawn... and then, while the left eye is covered by the black 180-degree sector: the right eye red, green, and then the blue image is drawn. Only one eye will see the Vectrex screen and its 3 associated images (or colors) at any one time while the other will be blocked by the 180-degree mask.[citation needed] The prototype was made in the plastic casework of a Viewmaster. The disc spins freely and is driven by a motor. The Vectrex software generates its own frame-rate and compares it to an index signal from the glasses once per revolution. Score is kept of how many wheel rotations are early compared to the software frame rate, and how many are late. The software tries to keep these two trends equal by adjusting the power being delivered to the motor that spins the filter and mask wheel. Pulse Width Modulation (PWM) is used to control the motor speed: the ratio of the "on" time versus the "off" time of a rapid stream of power pulses to the motor. In this way the software synchronizes the wheel rotation to the software's frame rate, or drawing time, for the combined and repeating group of up to 6 evolving images.

A single object that does not lie on the plane of the monitor (i.e., in front of or into the monitor) is drawn at least twice to provide information for each eye. The distance between the duplicate images and the angles from which they are drawn will determine where the object will appear to "be" in 3-D space. The 3-D illusion is also enhanced by adjusting the brightness of the object (dimming objects in the background). Spinning the disk at a high enough speed will fool the viewer's eyes/brain into thinking that the multiple images it is seeing are two different views of the same object due to the persistence of vision. This creates the impression of 3-D and color.[citation needed]

The same 3-D effect is in fact possible with raster or film-projection images, and the shutter glasses used in some 3-D theaters and virtual reality theme park rides work on the same principle.

The light pen allows the user to "draw", to create images and to indicate, on the screen. It has a photo-detector that can see the bright spot of the vector-drawing display monitor when it goes by under the light pen's position where it is being held to the screen. The photo-detector feeds internal pulse-catching circuits that tell the Vectrex and its software of the event. The prototype was made in the plastic casework of a Marks-A-Lot felt-tipped marker pen. The Vectrex draws a spider-web-like search-pattern to track the pen's location. The software changes the pattern size as the pen changes motions and velocity in an attempt keep a continuous lock on the pen's position. The Vectrex light pen was invented by John Ross.

Screen overlays

In order to enhance the display visuals of the Vectrex, every commercially released game included its own unique translucent plastic screen overlay that accompanied the cartridge. Instead of physically touching the CRT screen, four tabs on the Vectrex console securely held them in place in front of it, with a small gap between the actual screen and the overlay. Made up of one to three colors for the play field area, these overlays provide the illusion of simple color graphics (on an otherwise black and white screen), helped reduced glare, flicker and gave the appearance of a flat screen. They also allowed changes in brightness intensity of vector graphics to be more visually distinctive. In some cases game designers created pseudo color cycling effects, for a sense of movement, by using alternating colored patterns. In addition to players' score areas, some overlays also contained additional artwork and patterns, to add to the game's play field. Across the bottom of each overlay are game-specific joystick and button functions as a guide for the player. Each overlay also displayed the title and logo of each game, along with a colored border or design, to add cosmetic flair to the Vectrex (much like an arcade machine with its marquee or side art). Overlays were not required, but added to the experience in terms of the visual look of game graphics and the overall display appearance of the console.


Some of the Vectrex's library consisted of ports of arcade hits, most of them brought to the console through a licensing deal with Cinematronics.[2]

The liquor company Old Mr. Boston gave out a limited number of customized Clean Sweep cartridges, with a Mr. Boston sticker on the box. The overlay was the regular Clean Sweep overlay with the Mr. Boston name, logo, and copyright info running up either side. The game itself had custom text, and the player controlled a top hat rather than a vacuum.[7] Clean Sweep was written by Richard Moszkowski.[8]


Byte in 1982 called Vectrex "one of the greatest game machines we have seen this year ... [Vectrex] is a good bet to score big with the consumer". The magazine praised the screen, stating that "it almost has to be seen to be believed; imagine playing games at home (or in the office) using vector graphics with three-dimensional rotation and zoom", and noted that "It is unusual and refreshing to see a product appearing on the market with its software ready to run".[9] David H. Ahl stated in Creative Computing Video & Arcade Games in 1983 that "Vector graphics really do make a difference, and the strong line-up of games helps immensely".[10]


Since late 1995, there has been a Usenet community of hobbyists writing games for ParaJVE, a Vectrex emulator.[3] It's emulation is also a compound of MESS[11][12][13][14][15] (included in MAME[16], so RetroArch too via libretro[17]), DVE,[18] lr-vex,[19] Vecx, with a Wii version called VectrexWii.[20] Schematics for a "Vectrex Multicart" cardrige is available, allowing to pack several games on one cardrige.[21], There are also several people[who?] manufacturing and selling newly made games, some complete as cartridges with packing and overlays in the style of the original commercially released games, others with varying degrees of packaging.

See also


  1. ^ Worley, Joyce (September 1984). "Farewell To Vectrex". Electronic Games. pp. 82–84.
  2. ^ a b c d e f g h Barton, Matt and Loguidice, Bill. (2007). A History of Gaming Platforms: The Vectrex, Gamasutra.
  3. ^ a b Classic Videogame Hardware Genius Guide Imagine Publishing. Chapter 9.
  4. ^ "Vectrex Programmers Guide - Project Breaker and the 6502 Vectrex".
  5. ^ What's New in Electronics, By William H. Hawkins, Popular Science, Nov 1983, Page 116, ...3-D game maker: Wear the Vectrex 3-D Imager,...the images from special plug-in games are in 3-D and color...made by GCE...Price: $50...
  6. ^ InfoViews:'Rush in, Shake hands, Vittle up, Proceed home', By John C. Dvorak, InfoWorld, 4 Jul 1983, Page 33, ..Anyway, the fantastic Vectrex arcade machine is due to become Vectrex II and come with an optional keyboard...One of the most interesting things at CES was a 3-D Vectrex machine. You put on some weird spinning glasses, and when you look at the screen, you see a full-color, 3-D image. It was strange because the colors were in the spinning glasses and somehow synchronized with the black-and-white TV image. It was great...
  7. ^ World’s Most Expensive Video Games 
  8. ^ "Vectrex Game Database". Vectrex Museum.
  9. ^ Clark, Pamela (December 1982). "The Vectrex Arcade System". BYTE. pp. 92–93. Retrieved 19 October 2013.
  10. ^ Ahl, David H. (Spring 1983). "The Vectrex Arcade System". Creative Computing Video & Arcade Games. p. 56.
  11. ^
  12. ^
  13. ^
  14. ^
  15. ^
  16. ^
  17. ^
  18. ^
  19. ^
  20. ^
  21. ^

External links

This page was last edited on 1 October 2020, at 04:50
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