One of the last useful uses of DOS is as an operating system for embedded applications such as a MAME cabinet or a dedicated jukebox. DOS loads quickly, is stable, and is supported by MAME. It does not multitask, which is a benefit in an emulation environment where every machine cycle counts. It also will run on much less hardware.
However, DOS was long out of fashion by the time the MP3 format rose to prominence. Thus, there are few DOS-based MP3 players, and those that do exist are either command-lne based or try to act as media players, not jukeboxes.
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