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FYI: In the original DOS era, you needed an add-on sound card (such as the SoundBlaster16) to get sound and digital music in games like DOOM.

But the AC97 replaced the add-on cards, and the old DOS games don't know how to talk to AC97.

SBEMU provides SoundBlaster emulation with OPL3 for AC97, and could be a way to play classic DOS games on newer PC hardware.

You can find it at SBEMU on GitHub:

https://github.com/crazii/SBEMU