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[Japo]

DOSBox can also do the aspect correction, using your graphics card, so maybe you'll get better quality. For this set "fullresolution=768x480" the same, and now also "aspect=true". Anyway aspect correction always makes you lose definition.

I didn't mean you change the TV set resolution, I'm assuming you're stuck with that. I suppose that if you computer sends your TV set an 768x480 image, you should get good definition (?) without further aspect correction. For example I know my newest TV set supports at least 800x600, I can use it as computer screen, and I get perfect definition if I use 800x600, but if I use another I get crappy definition due to aspect correction and aliasing.

I mean you edit dosbox.conf and set "fullresolution=768x480". I don't know if it will work, perhaps your computer's graphic card can't output that resolution even if it's the only one your TV set can input... But try it. However I don't know specifically how those old TV sets work.

DOS games usually have either 320x200, or 640x400, or 640x480 pixels. If you manage to make your card output 768x480, and your TV set doesn't add noise (I can't help you with that, other than recommending to use the precise resolution it supports), you should get good images.

With default scaler settings, DOSBox will resize the game's image if necessary, following integer ratios only and the same one for height and width (keeping aspect), until it fits as much of "fullresolution" as possible. The rest of the "fullresolution" will be filled with a black frame.

For example I've tried setting fullresolution=768x480 in my DOSBox. DOSBox does output an image with that size, but either my graphic card or my screen, none of which support that resolution of course, falls back to the closest supported one, 800x600, but they're not so kind as DOSBox to center the image. You can see the result here:


(click to enlarge)

If you think how the image is handled at each step, it's pretty straight forward what will happen. However in your cause I don't really know what your TV set may do on top of all this.