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→Intellivision II
==Intellivision II==
[[File:Intellivision_II_Console.jpg|thumb]]In addition to the [[Entertainment Computer System|ECS]] module, 1982 also saw the introduction of a redesigned model, called the Intellivision II (featuring detachable controllers and sleeker case), the [[System Changer]] (which played Atari 2600 games on the Intellivision II), and a music keyboard add-on for the ECS.
Instead of an internal power supply like the original system had, the Intellivision II would use an external AC adapter. Its main drawback, however, was that it was a non-standard power supply — running on 16.2V — meant that if the AC adapter was lost or damaged, the system could be rendered useless, as replacement power supplies for that particular voltage requirement were not readily available.
Mattel also changed the Intellivision II's internal ROM program (called the EXEC) in an attempt to lock out unlicensed 3rd party titles. To make room for the lock-out code while retaining compatibility with existing titles, some portions of the EXEC code were moved in a way that changed their timing. While most games were unaffected, a couple of the more popular titles had certain sound effects that the Intellivision II reproduced differently than intended, although the games remained playable. Mattel's attempt to lock out competitors' software titles was only temporarily successful, as the 3rd-party game manufacturers quickly figured out how to get around it.
==Add-on==
