PTS-DOS
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PTS-DOS is a disk operating system, a DOS clone, developed in Russia by Phystechsoft. A few programmers quit Phystechsoft and founded Paragon Software GmbH.
Thus there are two versions (derivatives) of PTS DOS: Paragon DOS Pro 2000 and PTS-DOS 2000.
PhysTechSoft continued developing PTS DOS and finally they released PTS DOS 32.