A blog post from The History Computer Museum explains that Apple contracted Paul Laughton of Shepardson Microsystems to write the Disk Operating System ... a BASIC interface, and utilities.

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Before Windows, there was MS-DOS—that’s the Microsoft Disk ...

a text-based disk operating system for computers that ran until 1998 with PC DOS 2000. It was Apple's Macintosh computers ...

The term DOS stands for Disk Operating System developed by Microsoft for micro computers. DOS is a single user operating system. It has a Character User Interface (CUI) i.e., communication between ...