Vectrex is one of the most inspired video game machines ever produced. Its point
of distinction is the fact that it uses vector "line" graphics (as opposed to raster "pixel" graphics). This is the same type of screen used in such arcade classics as Space Wars, Asteroids, Battlezone and Tempest.
The machine has a 9 x 11 inch black and white screen and comes with a built-in Asteroids clone called Minestorm. The games come with plastic overlays that slide over the screen to cut down on flicker and give some illusion of color.
It uses an 8 bit processor, the 68A09 (6809 with 1.5MHz clock speed), and a popular (at that time) sound chip, General Instruments AY-3-8912, which can produce a wide range of noises. Also included is a 1.5 inch, self-centering,
joystick with 4 buttons on the right. It uses an analog/potentiometer system allowing differing degrees of directional input.
Source : Vectrex FAQ
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BUILT IN SOFTWARE / GAMES
Mine Storm (built-in the system)
One built-in controller (joystick + 4 buttons). Second controller optional.