For anyone interested in the guts of old Apple products, check out this video from EEVBlog. This guy is pretty enthusiastic about circuit boards! He has also done teardowns of other electronics from the same era, including a huge ancient hard drive that is bigger than a watermelon.
https://www.youtube.com/watch?v=_hxdz6c8bHg
https://www.youtube.com/watch?v=_hxdz6c8bHg