Macintosh TV liked required so little investment on apple's part that they didn't care if it would fail. Putting a TV tuner card into a computer and creating black cases doesn't require a lot of effort.
The Newton, while not selling as well as Apple would have liked, I don't can be called a failure. The idea basically lives on to this day. PDAs caught on everywhere, and now almost everyone has one. Of course, only a small percentage of them are Apple products.
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