While it’s true that C compilers must follow the C language specification (depending on year; a compiler from the 80s won't support C11), compilers can differ in the extensions. For example, they all use stdio, but Unix adds curses, DOS uses conio.
This article compares several compilers: OpenWatcom, TurboC, and BCC:
https://allthingsopen.org/articles/turboc-open-watcom-two-c-compilers-interfaces
It also has 2 programs (TurboC and OpenWatcom) showing conio windows and colors.
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