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PhysTechSoft PTS - DOS Version 7.00 Revision 0 (PTS-DOS 7.0 Beta version) 720x400.png
PhysTechSoft PTS - DOS Version 7.00 Revision 0 (PTS-DOS 7.0 Beta version)
DeveloperPhysTechSoft & Paragon Technology Systems
OS familyDOS
Working stateCurrent
Source modelClosed source
Initial release1993; 29 years ago (1993)
Latest releasePTS-DOS 32
Kernel typeMonolithic kernel
Influenced byMS-DOS
user interface
Command-line interface (COMMAND.COM)
Paragon Technology Systems PTS/DOS 6.51CD & S/DOS 1.0

PTS-DOS (aka PTS/DOS) is a disk operating system, a DOS clone, developed in Russia by PhysTechSoft and Paragon Technology Systems.

History and versions[edit]

PhysTechSoft was formed in 1991 in Moscow, Russia by graduates and members of MIPT, informally known as PhysTech. At the end of 1993, PhysTechSoft released the first commercially available PTS-DOS as PTS-DOS v6.4.[1][2] The version numbering followed MS-DOS version numbers, as Microsoft released MS-DOS 6.2 in November 1993.

In 1995, some programmers left PhysTechSoft and founded Paragon Technology Systems. They took source code with them and released their own version named PTS/DOS 6.51CD as well as S/DOS 1.0 ("Source DOS"), a stripped down open-source version. According to official PhysTechSoft announcements, these programmers violated both copyright laws and Russian military laws,[3] as PTS-DOS was developed in close relationship with Russia's military and thus may be subject to military secrets law.

PhysTechSoft continued development on their own and released PTS-DOS v6.6 somewhere between[3] and presented PTS-DOS v6.65 at the CeBIT exhibition in 1997.[2] The next version from PhysTechSoft, formally PTS/DOS Extended Version 6.70[4] was labeled PTS-DOS 2000 and is still being distributed as a last 16-bit PTS-DOS system, as of 2007.

Paragon continued their PTS-DOS line and released Paragon DOS Pro 2000 (also known and labeled in some places as PTS/DOS Pro 2000). According to Paragon, this was the last version and all development since then ceased. Moreover, this release contained bundled source code of older PTS-DOS v6.51.[4]

Later, PhysTechSoft continued developing PTS-DOS and finally released PTS-DOS 32, formally known as PTS-DOS v7.0,[4] which added support for the FAT32 file system.

PTS-DOS is certified by the Russian Ministry of Defense.[5]


The following list of commands are supported by PTS-DOS 2000 Pro.[6]

Exclusive commands[edit]


This command is specific to PTS/DOS 2000.[7] Paragon's description is (quote)

  • Purpose: Restores the booting of a system installed before PTS-DOS on the disk and restores its the boot sector.
  • Syntax: UNINSTALL filename [drive:]
(balance omitted)[8]

Hardware requirements[edit]

See also[edit]


  1. ^ "MS-DOS-Clone made in Russia". Computerwoche. 1994-05-06. Retrieved 2015-04-12.
  2. ^ a b Official PhysTechSoft site: About PhysTechSoft
  3. ^ a b Unofficial PTS-DOS FAQ in English
  4. ^ a b c Unofficial PTS-DOS FAQ in German
  5. ^ Official PhysTechSoft site: Operating System PTS-DOS 2000
  6. ^ "PTS-DOS 2000 Pro User Manual" (PDF). Buggingen, Germany: Paragon Technology GmbH. 1999. Archived (PDF) from the original on 2018-05-12. Retrieved 2018-05-12.
  7. ^ "PTS DOS 2000 Pro User Manual" (PDF).
  8. ^ to avoid CopyVio

External links[edit]