I really should mention the website of Jed Margolin which has a lot of information about his time at Atari, including his work with vector games.

With dithering added to my modified version of xmame, the games look a bit better. Here are a few new screenshots.] With "dithering", I can not only output the 256 distinct values supported by the VGA DAC, but I can display 3 intermediate values between any two adjacent values, for a total of 256 + (255*3) = 1021 values.

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asteroids.jpg
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bzone.jpg
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llander.jpg
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tempest.jpg