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Millennial discovers DOS. Film at 11.

;)

It's running only on BIOS, no operating system.

That's literally what DOS is... a loading program that itself ran from a boot sector and provided services layered on top of BIOS calls.

I "discovered" DOS 25 years ago, not sure what's your point?

Sorry, I read your comment as "he's running this on DOS" not "he's made something that runs at the same level as DOS".