How to run Doom on PC without OS?

Question

Iron

I got an extremely old computer here, it doesn’t even have a hard drive, but it is fully functional and initializes the BIOS. For the sake of curiosity, I wanted to launch the first doom on it. Habravchan friends, who knows how to do this?

Answer 1

Make a bootable flash drive with DOS and write Doom there, boot into DOS, run the exe file and that's it.

Answer 2

If it is with uefi, then you can have fun: https://github.com/Cacodemon345/uefidoom .
Otherwise - only from boot floppy disks / disks / flash drives