If you are a fan of classic PC gaming (pre-windows era) then you need to have and use DOSBox, especially since it’s free and there’s hundreds of DOS games legally free all over the internet.
You can download DOSBox for free at its main site here. You can adjust the speed of the game using hotkeys and it’s not just for gaming. I’ve ran a bunch of DOS applications that banks, doctors, lawyers, and accounting clients of mine still use that are from the DOS days. It’s the best legacy program I know. This is one of the top favorite programs of the Obsolete Gamer Staff.
Get out there and get them!