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Would it be possible for the Commodore 64 or 128 to display CGA or VGA graphics?


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Short answer is no.

 

Long answer is:

 

It's, well, complicated. What with Commander Keen being a DOS game, it runs on completely different hardware than Commodore machines. But let's say you successfully port the game to C64. If you want real CGA or VGA graphics, you'll have to build yourself a video card that plugs into the cartridge or user port that, you know, functions as a CGA or VGA card. And write a bunch of code so the C64 can control it.

 

A much smarter way to do it would be just to use the good ole bitmap graphics mode to mimic the graphics as closely as possible.

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I know that the VDC chip on the C128 can be coaxed into all kinds of weird resolutions and frequencies, if you have the right monitor for it. There is some 320x400 mode @ 31 kHz IIRC that is rather interesting.

 

But yes, like Bluejay writes, if you build your own e.g. ISA bus which has been done, you could in theory drive a CGA or VGA card that way. I'm sure there are cheaper possibilities like using a Propeller that mimics it but in any case you would rely on 3rd party hardware.

 

Otherwise your option is to redraw graphics with the capacities built-in like it also was mentioned.

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