Q: How to play MP3 files with the speaker under DOS?
A: There are many MP3 players under DOS, such as QuickView, MPXPlay, OpenCP, DAMP, and even the old DOSAmp, etc., but most can only achieve playback with a sound card. To play MP3 files with the speaker, you can use a media software called DSS in full-screen mode (can be downloaded in the "Media Software" on this site) to achieve playback/recording of MP3 or WAV files with the sound card or PC speaker. The specific method is to change the device in DSS.INI to the device you want to play, for example, 1 is Sound Blaster, 8 is the PC speaker, and there are some other devices, such as ESS sound card, etc., which can be seen in its instructions. Or there is another way, that is, first convert the MP3 to a WAV file with software such as L3ENC, and then use software such as QuickView 1.x, SBPlay, etc. (also available on this site) to achieve playback of the converted WAV file with the PC speaker.
Excerpted from the webmaster's "Common Questions and Answers (FAQ) in DOS Usage"