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There is a big misconception in this thread. What you are asking for isn't upscaling, as Rob6021 previously explained. The concept of rendering at different resolution of what the game is programed for requires much more than only having more backbuffer ram, or more pixel or polygon power.

You need to capture all the draw calls, and transform them through emulation to the higher resolution. It's a much harder problem that many believe, because even when you have compatible architectures, emulation is usually orders of magnitude slower. You only have to look at the speed differential in DosBox, being software emulation on a much higher speed, compatible architecture, than running the games in the original machines. You need a Pentium 2 233 to run games at the same speed than a 386 SX 33.