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leader1188 - 2015-02-09 4:10 PM
exists some tutorial how to run on my handheld compaq c810 MS-DOS??
You can't just install DOS. Back in the day there was a nagware applet called PocketDOS which was first released in the CE 2 days, but it's been unavailable for years.
If you want DOS, you'd probably be better off with an HP 200LX or something.