When Mattel contacted Radofin for a computer system they found that Radofin already designed a line of three computers. The Aquarius I (internally known as "checkers") was designed as the entry level system, while the Aquarius II ("chess") was the system for the more serious programmer featuring a typewriter-like keyboard and Extended Basic. Mattel and Radofin discussed over the Aquarius II about giving it more memory and programmable graphics with hi-res graphics capability (character resolution of 320x196).

In the latter part of 1983, Mattel's accountants advised that the toy gigant should pull out of the home computer market completely, and the "Aquarius III" unit never made the market.