Some of the OEMs included Zenith, Eagle Computer, TI, and Sanyo. This was the first version of MS-DOS to be released to OEMs other than IBM with similar functionality. The OEM for IBM is called PC-DOS and version 6.xx of PC-DOS is quite different than MS-DOS 6.xx with the development of it being done completely by IBM. There are ways to crudely multi-task via TSR's and other shells that hook the clock interrupt and jump execution, although these are usually unstable at best.ĭOS made use of the FAT file system, and thus its popularity. It is designed to be a single tasking OS, that runs on the 8088/8086 CPU, and on the real mode of the 80286 and higher CPU's. MS-DOS uses the Int21 interface to allow programs to communicate with MS-DOS. This has been the best ROI ever, as MS-DOS has made Microsoft untold billions of dollars. At the time Microsoft had no such product but was able to secure the rights to " 86-DOS", a CP/M clone written by Tim Paterson, for the sum of $50,000. Microsoft had sold IBM on the idea of MS-DOS when talks for CP/M had broken down. MS-DOS was made popular by Microsoft for not only being the bundled operating system on the IBM-PC but also being available to the other clone OEM's of the time.
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