![]() Networking features seemed to have been postponed to the successor of DOS, OS/2, which was officially announced by Microsoft and IBM in 1985 (and released in 1987). Microsoft was also busy working on the applications that should become the corner stones of its success: "Multiplan"/"Excel" and "Word". Networking was none of its capabilities and other tasks may have been far more important: The first DOS did not even know how to handle hard disks. Version 1.0 of the "Microsoft Disk Operating System" (MS DOS, also sold as "PC DOS" by IBM) had 4.000 lines of code. ![]() They bought and adapted Seattle Computer's "Quick and Dirty OS" (QDOS) to meet IBM's expectations. Microsoft agreed to come up with an OS prototype, similar to CP/M, in just three months. The young software company Microsoft, originally only supposed to provide language interpreters and compilers as BASIC and Fortran, stepped in. The operating system (OS) for the PC had to be done in an extremely short period of time, after Digital Research (DR) had blown the opportunity to license their "Control Program for Micros" (CP/M) to IBM. ![]() The IBM Personal Computer (PC) was introduced on August 12th, 1981 as an answer to the Apple II, that challenged IBM's market with office software like VisiCalc and WordStar. ![]() 3.4 Software by universities and hobbyists.
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