It's stretching the definition of "3D-focused graphics chip", but an early example might be I, Robot. An 8-bit 6809 CPU drives a custom polygon-pushing graphics

It's stretching the definition of "3D-focused graphics chip", but an early example might be I, Robot. An 8-bit 6809 CPU drives a custom polygon-pushing graphics processor. It's primitive but must've been mind-blowing in 1984. https://en.wikipedia.org/wiki/I,_Robot_(video_game) https://en.wikipedia.org/wiki/I,_Robot_(video_game)