While compatible with earlier Apple II systems , the IIGS was in closer competition with the Atari ST and Amiga .
A 16 - bit model with much more advanced graphics and sound , the Apple IIGS , was added in 1986 .
While compatible with earlier Apple II systems , the Apple IIGS was in closer competition with the Atari ST and Amiga .
A 16 - bit model with much more advanced graphics and sound , the Apple IIGS , was added in 1986 .