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Question about Sierra’s EGA640.DRV dithering

Total Posts: 1

Joined 2020-02-27



Some Sierra games like Space Quest 5 came with both a VGA driver (which I assume is just regular 320x200 mode 13h) and an EGA driver than ran in 640x200 resolution. This EGA driver “dithered” the game graphics to 16 colors.

My question is, EGA also has a 320x200 16-color resolution. Why did the Sierra driver ran in 640x200? Did the driver do vertical interlacing? Line doubling? And if so, why?

I’m just confused why the images don’t look stretched if they doubled the vertical resolution during the dithering process.


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