Altair 8800 predates everything.
And putting a shiny GUI on a computer does not change the fact that it's a computer. It's still doing basically the same things, just the input is different.
See above.
Edited to add: Look, I love Apple, but I'm just saying they don't create new product categories. Google is the same. There's nothing wrong with that - there's not a lot of stuff left to invent.
Now you're being silly. You changed categories again. The Altair 8800 predates the Apple ][, but it's certainly not a personal computer.
And you say "there's not a lot of stuff left to invent?" Uh huh: "Everything that can be invented has been invented."
--Charles H. Duell, Commissioner, U.S. Office of Patents, 1899.
We should have closed the patent office in 1900.