Editing Intellivision (section)

===Intellivoice===
{{Main|Intellivoice}}
[[File:Intellivoice.jpg|thumb|right|alt=Brown rectangular box with a volume knob|The [[Intellivoice]] add-on]]
In 1982, Mattel introduced the Intellivoice Voice Synthesis Module, a [[speech synthesis|speech synthesizer]] for compatible cartridges. The Intellivoice was novel in two respects: human sounding male and female voices with distinct accents, and speech-supporting games designed with speech as an integral part of the gameplay.

Like the Intellivision chipset, the Intellivoice chipset was developed by [[General Instrument]]. The [[General Instrument SP0256|SP0256-012]] orator [[Integrated circuit|chip]] has 2KB [[Read-only memory|ROM]] inside and is used to store the speech for numerical digits, some common words, and the phrase "Mattel Electronics presents". Speech can also be processed from the Intellivoice's SP650 buffer chip, stored and loaded from cartridge memory. That buffer chip has its own [[Input/output|I/O]] and the Intellivoice has a 30-pin expansion port under a removable top plate. Mattel Electronics planned to use that connector for wireless hand controllers.<ref>{{cite web|url=http://www.intellivisionlives.com/bluesky/hardware/voice_tech.html#systag|archive-url=https://web.archive.org/web/20170516015209/http://www.intellivisionlives.com/bluesky/hardware/voice_tech.html#systag|url-status=usurped|archive-date=2017-05-16|title=Intellivision Classic Video Game System / Intellivoice Module|website=www.intellivisionlives.com}}</ref>

Mattel Electronics built a state of the art voice processing lab to produce the phrases used in Intellivoice games. However, the amount of speech that could be compressed into an 8K or 12K cartridge and still leave room for a game was limited. Intellivoice cartridges ''Space Spartans'' and ''B-17 Bomber'' did sell about 300,000 copies each, priced a few dollars more than regular Intellivision cartridges. However, at $79, the Intellivoice did not sell as well as Mattel expected; Intellivoices were later offered free with the purchase of a Master Component.<ref name="lives_hw" /> In August 1983, the Intellivoice system was quietly phased out. A children's title called ''Magic Carousel'' and foreign-language versions of ''Space Spartans'' were completed but shelved.  Additional games ''Woody Woodpecker'' and ''Space Shuttle'' went unfinished with the voice recordings unused.

Four Intellivoice games were released: ''[[Space Spartans]]'', ''[[B-17 Bomber (video game)|B-17 Bomber]]'', ''[[Bomb Squad (game)|Bomb Squad]]'', and ''[[Tron: Solar Sailer]]''.

A fifth game, ''[[Intellivision World Series Baseball|Intellivision World Series Major League Baseball]]'', developed as part of the Entertainment Computer System series, also supports the Intellivoice if both the ECS and Intellivoice are connected concurrently. Unlike the Intellivoice-specific games, however, ''World Series Major League Baseball'' is also playable without the Intellivoice module (but not without the ECS).