The Adventure Vision didnt need an external monitor it was a cartridge-based video game console released in 1982. Controled by a single joystick and two sets of four buttons, one on each side of the joystick, for ease of play by both left- and right-handed players.
An interesting feature of the Adventure Vision is its "monitor." Rather than using an LCD screen, the Adventure Vision uses a single vertical line of 40 red LEDs combined with a spinning mirror inside the casing. This allows for a screen resolution of 150 x 40 pixels.
The game cartridges can be stored in spaces on top of the case.
Drawbacks to the Adventure Vision are its monochrome (red) screen as well as the mirror motor, which draws a great deal of power from the batteries. The latter problem can be solved easily by the use of the built-in AC adapter port.
Many casual fans dismiss the Adventure Vision as a failed handheld console. In fact, it was a tabletop console that was much too large and fragile to be used effectively for handheld purposes.