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This is the real deal here.

CDOS was a multitasking, eventually x86-32 native, OS that could multitask DOS apps even on a 286.

Back in the 20th century the limitations on a multitasking DOS were largely around hardware compatibility: could it talk to your network card, sound card, CD drive, and let multiple DOS apps access them?

But now, DOS networking is largely irrelevant: it didn't natively talk TCP/IP and nobody cares about IPX/SPX or NetBEUI. Few have a CD-ROM any more. You probably need a driver shim to emulate a Soundblaster anyway.

However all those 10s of thousands of DOS apps are still there and still work.

For DOS there's FreeDOS, SvarDOS, PDOS, and others, including this project.

A modern FOSS CDOS clone would be great fun.