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There were DOS clones and other operating systems back then. CP/M, DR-DOS (take a look at VIEWMAX), PC-MOS, VM/386...

Part of the problem was you needed to get your OS on all the computers out there, most clone builders had agreements with Microsoft. The other was you needed DOS compatibility, or else you didn't have any software to run.



I wouldn't call CP/M and DR-DOS "clones" of MS-DOS. It's more the other way around: MS-DOS originated as a x86 clone of CP/M!


I meant dos clones and other operating systems




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