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Yes

For today's applications? It sucks. A lot

Thread/Process control in MSDOS? In your dreams

Network? Are you running Netware? Otherwise you're SOL

Sound output? Sure, just set up DMA and IRQ yourself for your Soundblaster card. I mean, you have one of those right?

> Sound output? Sure, just set up DMA and IRQ yourself for your Soundblaster card. I mean, you have one of those right?

What has OS got to do with possession of some hardware?

If the OS doesn't provide an actual sound API developers will only write support for the most popular sound cards.

I remember games which had extra features if you had a Gravis UltraSound.

The knowledge gap of the modern js devs is funny, thinking MS-DOS has any concept of what a soundcard is.

Though even first Unixes "it's a file, just write to it" were better but just above the bare minimum