Switch to MS-DOS

The Computer Chronicles in March of 1984 had an episode on Operating Systems. They featured CPM, DOS without reference to one being better or the future of Operating Systems. Linked here.

"Many of IBM's recent problems have resulted from management's failure to recognize that the personal computer would one day be something more than a home toy. To IBM's senior management in the 1970s and early 1980s the future was still in mainframes and minicomputers for commercial use. According to one member of the Management Committee, 'the general attitude was that you don't have big problems in small markets, and we thought the personal computer was a very small market.' In 1985, for example, Don Estridge, the original mastermind of the IBM PC operation, wanted to produce a new line of PC's based on Intel's fast 80386 microprocessor. Estridge theorized that the way to fight the PC clones was to destroy them by producing much faster and better PCs. The Management Committee, fearing that faster PCs would threaten IBM's mainframe business, which still was the basis for most of IBM's revenues, refused to approve Estridge's plan."
(Market Dominance, David I. Rosenbaum, 1998)