Apple IIGS (Wikipedia) The Apple IIGS (styled as IIGS) is a 16-bit personal computer produced by Apple Computer. It is the fifth and most powerful of the Apple II family. It is compatible with earlier Apple II models, but has a Macintosh look and feel, and resolution and color similar to the Amiga and Atari ST. The “GS” in the name stands for “Graphics and Sound”, referring to its enhanced multimedia hardware, especially its state-of-the-art audio.