Revision History
While in production between September 1986 and December 1992, the Apple IIGS remained relatively unchanged from its original inception. During those years, however, Apple did produce some maintenance updates to the system which mainly comprised two new ROM-based updates and a revamped motherboard. It is rumored several prototypes that greatly enhanced the machine's features and capabilities were designed and even built, though only one has ever been publicly exposed (i.e. the "Mark Twain"). Outlined below are only those revisions and updates officially released by Apple.
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