Download Source Code for MS-DOS operating system v1.25 and v2.0

MS-DOS (short for Microsoft Disk Operating System) is the operating system of software company Microsoft. This operating system is designed and used on a command line interface. That is, type a command to execute, but there is no graphical interface like now. MS-DOS was widely used in the 1980s until the appearance of MS-DOS Windows 95. The 2 main versions are MS-DOS v1.25 and v2.0

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Do you know about MS-DOS v1.25 and v2.0 operating systems?

About 35 years ago, a young company called Microsoft released MS-DOS, a predecessor operating system to what is now Windows.

If you are familiar with CMD (command prompt), to type commands on Windows. Then MS-DOS was the predecessor of CMD. Today, Microsoft has removed some MS-DOS commands from CMD, retaining only a few basic commands, suitable for the new operating system structure.

The source code for MS-DOS v1.25 – the first version of MS-DOS released to general PC manufacturers – is available only 7 source files. When compiled, version 1.0 of the operating system only takes up about 12kb of memory, the size of only one HTML file today.

MS-DOS was written in a very low-level programming language. While the majority of Windows was written in the C, C++, and C# programming languages, MS-DOS v1.25 and v2.0 were written in assembly 8086.

Unlike readable high-level languages, which today abstract away many of the details of how the CPU processes instructions, in the 1970s and early 1980s it was often necessary to write software in low level and executed by CPU.

Writing software in assembly was necessary to squeeze performance out of the system at the time, so there were limitations in speed and memory compared to modern computers now.

Download source code MS-DOS

Microsoft has now released the source code for MS-DOS v1.25 and v2.0 on GitHub, the second time the source for the command-line-based operating system has been made publicly available. You can download the MS-DOS v1.25 and v2.0 source code for free for further research or development depending on your personal purposes.