I played this on the original IBM PC. (Un)fortunately, my dad got the 8MHz upgrade, so the game was really hard, because it was built for a 4MHz clock.
Luckily someone eventually realeased a DOS utility that would fake a 4MHz clock by making everything take two cycles.
Good times. :)
Was the utility called slomo? I recall having to do something like `slomo sopwith.exe` to bring the processing loop back down into human ranges of reaction times.
I think ours had a turbo button that would double/half the clock speed. Good times indeed :)