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Just for refence. C and non flat memory model used to be REALLY common. It was called MS-DOS, and Win16 https://stackoverflow.com/questions/8727122/explain-the-diff...

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Few if any programs actually used segmented memory in MS-DOS as segmented memory. C compilers of the era combined both fields into 20-bit pointers. Pointer arithmetic was kind of messy but had compiler support.

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