[klodolph]

This is a misinterpretation of the experiment results.

By default, aspect=false. This gives incorrect results, as you observed, with Logo producing a squashed circle and square.

The fix is aspect=true (or aspect=1). This gives correct results, with non-square aspect for pixels, with Logo producing a more correct circle and square.

Because the Logo implementation was written for an actual IBM PC or compatible, it assumes that the aspect ratio of a 320x200 pixel screen is about 4:3. However, when displayed with the incorrect square-pixel aspect ratio given by default in DOSBox, it will be 8:5.

In other words, DOSBox displays graphics with a square pixel ratio by default, which is different from the original hardware. If you wrote a DOS program to draw a square number of pixels, say 128x128, then you would see that in DOSBox it would also be square, but on real hardware it would be about 20% taller than it is wide. If you use Logo you will get the opposite results, because Logo is correctly designed for the original hardware.