Microsoft Pascal is a discontinued implementation of the Pascal programming language developed by the Microsoft Corporation for compiling programs for running on its MS-DOS and Xenix[5] operating systems and, in later versions, on OS/2 (like many other Microsoft programming tools, albeit they are only capable of generating 16-bit programs for the latter).
^The Microsoft Archives, By Ben Armstrong, 8 Dec 2004, MSDN Blogs, One of the cool things about working at Microsoft is having access to the Microsoft Archives. It turns out that Microsoft has been quite fastidious about keep record of all product and press releases since the beginning of time. ...In 1980 Microsoft actually released their own PASCAL compiler - this was something that I never knew. This compiler was maintained through to 1988.