OR Microsoft announced today that GW-BASIC is now open source. In 1983, the Microsoft released the GW-BASIC for IBM PC XT and compatible PCs. The GW-BASIC is a BASIC interpreter from IBM Advanced BASIC / BASICA.
According to Microsoft releases the code of GW-Basic because this code has been the source of the 10 assembly language since February 1983, 8088 and must be open for historical reference and educational purposes. This means that they will not allow it to be modified and exploited in any way.
Except GW-BASIC and back in 2014, the Microsoft had released MS-DOS as part of a collaboration with the Museum of Computer History. In 2018, the Microsoft reopened MS-DOS at GitHub. The new files there contain the original source code and the compiled binary files for MS-DOS 1,25 and MS-DOS 2.0.