GS = graphics/sound. That was one of the main advertising ploys from Apple at the time. This was certainly an amazing machine, that could network, talk to scsi devices, and access 16 MB of RAM (through addon piggyback memory boards from Applied Engineering.) My jealous friends with their Tandy computers said GS stood for "Graphics suck".

Playing around too much with the Ensoniq sound chip would burn it out for life, like mine did one day after just purchasing Taito's "Arkanoid".