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MS-DOS 1.0 was released in 1981. The original Macintosh was released in 1984.

By which time Apple Computers had already been in business for 8yrs and had produced a couple of successful designs, and their own OS. IINM, the original “Classic Macintosh OS” - the first consumer software to feature a GUI and use a mouse/pointer - predated Windows by a year.

The first decade of home & small business computers was a bit of the Wild West, and subject to much revisionist history, and most certainly as to the dynamics of relationships between the two Steves and messers Gates/Allen.

If any single person could be credited for “inventing” what evolved into MS -DOS, that would be Timothy Paterson.

OK, kiddies, time fire up your favorite search engine and selectively curate Internet results to buttress your individual positions.
 
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Most know about the Apple II, released in 1977. I owned one with two floppy drives, which
tended to (and did) burst into flames. That machine did not run MS-DOS, it ran Apple DOS and Basic.
I ran VisiCalc and WordStar on it.

The Apple Lisa, with a Xerox Star-like operating system, was released in 1983. I didn't buy that one.
The original Macintosh was released in 1984, but I didn't buy that one either.

Microsoft Windows 1.0 was released in 1985. However, it was just a menu program that selected
user-installed DOS programs to run. I used it on my IBM AT to run SPICE (in DOS of course),
but Windows 1.0 was pathetic, actually. There were other, much better, menu programs at that time.
 
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