How to present MS-DOS screenshots

from blog Computer Graphics & Programming with Pekka Väänänen - 30fps.net, | ↗ original
MS-DOS games that ran at 320x200 screen resolution didn’t have square pixels. This means the image was vertically stretched by the cathode-ray tube to fit the 4:3 aspect ratio of the actual display screen. As a consequence, screenshots taken of such games must be scaled vertically to look right on modern displays with square pixels.