Microsoft DOS V1.1 and V2.0 Source Code

With the permission of Microsoft Corporation, the Computer History Museum is pleased to make available the source and object code to Microsoft’s MS-DOS operating system versions 1.1 and 2.0, for non-commercial use.

The zip file contains four subdirectories:

• v11source: 7 assembler code files, and an explanatory email from Tim Paterson
• v11object: 27 files, some binary programs and some sample programs
• v20source: 118 text files, mostly assembler code and some documentation
• v20object: 38 files, some binary and some documentation

http://www.computerhistory.org/atchm/microsoft-ms-dos-2-0-source-code/

Do we have to pay IBM or was it Xerox or DRDOS or who did they dupe to get 1.0?

drmike said:

Do we have to pay IBM or was it Xerox or DRDOS or who did they dupe to get 1.0?

Click to expand...

Seattle Computer Products owns 86-DOS 1.0 which is a port of CP/M (for 8080/Z80) to run on 8086 processors. Microsoft bought 86-DOS 1.10 from them for $75,000 in July 1981 and kept the version number, but renamed it MS-DOS 1.1.