You mentioned "First specialized Graphics processors". I think we can extend things backwards a bit. Earlier machines had specialized sound processors and MPEG

You mentioned "First specialized Graphics processors". I think we can extend things backwards a bit. Earlier machines had specialized sound processors and MPEG decoder chips. As I recall, the early Macs used a 6502 as an I/O controller, and you could get a card for your Apple ][ that would run IBM PC software. I only mean to extend your timeline. I don't think my observations change your conclusion.