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 Microsoft has opened the code for 86-DOS and PC-DOS.
 May 1st 2026
(language: English // Russian)
Microsoft published under the mit license the source code of the operating systems 86-DOS 1.00 and PC-DOS 1.00, as well as the runtime libraries of the Microsoft BASIC-86 compiler, the SCP assembler, the chkdsk and EDLIN utilities. PC-DOS 1.00 is notable for being the first release of dos for IBM PC computers. The code was restored as part of a project to reconstruct the code of the first versions of dos for the CPU 8086, by scanning and transcribing archived paper printouts,
established in 1981 and 1982.
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