Sopwith is a sidescrolling shoot 'em up created by David L. Clark of BMB Compuscience in 1984. It was originally written to run on the IBM PC under DOS but there was also a port made near the time of its creation for the Atari 520ST. More recent versions have been ported to even more systems. The game involves piloting a Sopwith biplane, attempting to bomb enemy buildings while avoiding fire from enemy planes and various other obstacles. Source: Wikipedia, "Sopwith (computer game)," available under the CC-BY-SA License.