I have not seen the DOS version of Robocop before, but I like how it’s more violent than the arcade version (which is the one I used to watch people play). For example, I don’t think the arcade version has that fountain of blood when you save the president at the end.
And I guess the DOS developers concluded that things wouldn’t be quite so futuristic in 1990 (just a year or two after the game’s release), so they changed it to 2000.
the master system version of altered beast was clearly made as a token afterthought, as cheaply and quickly as possible. the player sprite is on a different scale to all the enemy sprites, and the humanoid enemies are on a different scale to the non-humanoid enemies. also it’s barely playable garbage.