(GS Operating System) A graphical operating system for the Apple IIGS that also accepts ProDOS applications.
"GSOS." YourDictionary, n.d. Web. 09 November 2018. <https://www.yourdictionary.com/gsos>.
GSOS. (n.d.). Retrieved November 09th, 2018, from https://www.yourdictionary.com/gsos
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