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MS-DOS 4.0 [a] was a multitasking release of MS-DOS developed by Microsoft based on MS-DOS 2.0. Lack of interest from OEMs, particularly IBM (who previously gave Microsoft multitasking code on IBM PC DOS included with TopView), led to it being released only in a scaled-back form.
The version included with PC DOS 3.0 and 3.1 is hard-coded to transfer the operating system from A: to B:, while from PC DOS 3.2 onward you can specify the source and destination, and can be used to install DOS to the harddisk. The version included with MS-DOS 4 and PC DOS 4 is no longer a simple command-line utility, but a full-fledged installer.
The DOS system initialization code will initialize its built-in device drivers and then load the DOS kernel, located in MSDOS.SYS on MS-DOS systems, into memory as well. In Windows 9x, the DOS system initialization code and built-in device drivers and the DOS kernel are combined into a single IO.SYS file while MSDOS.SYS is used as a text ...
In 2018, Microsoft released the source code for MS-DOS 1.25 and 2.0 on GitHub, with the source code for MS-DOS 4.00 being released in the same repository six years later. [ 3 ] [ 23 ] The purpose of this, according to Microsoft, is mainly for education and experimentation with historic operating systems and for new programmers to gain an ...
COMMAND1.ASM on GitHub - Source code to COMMAND.COM version A067 released by Microsoft as part of MS-DOS 4.0; COMMAND.ASM on GitHub – Source code to COMMAND.COM version 2.11 released by Microsoft as part of MS-DOS 2.0; COMMAND.ASM on GitHub – Source code to COMMAND.COM version 1.17 released by Microsoft as part of MS-DOS 1.25
DOS/32 has been commercially available since 1996. As of May 2002, it was released to the public in the form of "Liberty Edition" along with its complete source code under terms similar to the Apache License of the time, [a] allowing unrestricted, royalty-free distribution with certain provisions regarding reference to it in documentation and the naming of derived software.
This specific version of MS-DOS is the version that is discussed here, as all other versions of MS-DOS died out with their respective systems. One version of such a generic MS-DOS (Z-DOS) is mentioned here, but there were dozens more.
Microsoft urged its OEMs to wait for a bug-fixing update of DOS 4.0 code before shipping their own versions. Microsoft released a DOS 4.0 Binary Adaption Kit - containing the operating system and utilities to help OEMs adapt it to their hardware - shortly after the mid-July announcement of DOS 4.0.