Page "Intellivision" Paragraph 23

Unfortunately, the amount of speech that could be compressed into a 4K or 8K ROM cartridge was limited, and the system did not sell as well as Mattel had hoped ; while the initial orders were as high as 300, 000 units for the Intellivoice module and its initial game-cartridge offerings, interest in future titles dropped rapidly until the fourth and last Intellivoice title, Tron: Solar Sailer, sold a mere 90, 000 units.

A fifth game, a children's title called Magic Carousel, was shelved, and in August 1983 the Intellivoice system was quietly phased out.