The readme says, "If you have a 386 or better with VGA graphics, run mars and use the mouse to move around the landscape." Are you sure it will run on a 286?
Yes. It was 16bit code. I ran it on my 8mhz 286, it ran smoothly.
On a 386 like my AMD 386/DX-40mhz it ran smoother than butter, with a 486/66 is was essentially too fast.
If I'm understanding this correctly, in 01993, Tim Clarke independently reinvented the painter's-algorithm variant of the VoxelSpace algorithm used in Comanche the year before.