looked Battlezone up at klov.com on a hunch, and didn't find out, but think it's the first vector game...yeah 1980, yeah, wiki implies that it is.
I used to love that vector game rip-off of Star Wars as a kid (before Star Wars and ESB machines came out)...it's called Starhawk. Man, I think that was my earliest favorite before I discovered that I could play Tempest and Phoenix well.
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