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While looking stuff up for another post I found a collection of every coverart for every intellivision game. Some really fantastic art in here.
(www.arcadepunks.com)
I really liked this cover for Thunder Castle. Never even heard of the game but this is the type of fantasy art I crave. Gameplay doesnt look too bad either!
That website you linked also hosts ton of roms and complete romsets for every possibly system.