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go to zophar.net find a dos version.
ZSNES was my emulator of choice for MANY years back when DOS was still a thing, even though I think I've always used the Windows versions. As far as I can tell, the DOS version is still "up to date", too:https://zsnes.com/index.php?page=files
I thought there was a DOS build of SNES9x (which is my current SNES emulator of choice) but a quick search didn't turn up any recent download links.
I still use NESticle X.XX on my 486 and Pentium
PCs. Sure, it's from 1998 but it still works GREAT on anything 486 DX2/66 or faster.
A hint about NESticle though.....when in real mode DOS, if you want to play Dragon Warrior IV, make sure you have at least 500k of base memory free and the ROM you are using is the old 1MB "bad" dump. If under 500k or with the current dump the ROM won't load but YMMV.