When I'm bored I fire up modplug tracker (so shoot me if it's modplug and not screamtracker/impulsetracker) and try to accurately reproduce the sound of another game system... in MOD format! Unfortunately, not the 4 channel limited-like-a-straightjacket Protracker MOD format, though. (SORRY AMIGA ENTHUSIASTS 🤣)

Here's a couple megadrivenesses
http://leileilol.mancubus.net/mods/rm/cdoorsmr.mod < i'm particularily proud of how this one turned out
http://leileilol.mancubus.net/mods/rm/cspeed.mod

I wonder how your 486s handle these with 12-channel+ capable DOS module players 😜 (Cubic Player 1.7+ recommended)

p.s. I only 'upgrade' to s3m when the song has too many unique patterns to continue as a mod