On PC, MS-DOS did not use C, rather interrupts and there was no common C ABI.
On OS/2, a mix of C ABI and SOM, with C, C++ and Smalltalk as main languages.
Windows started only with the C ABI, nowadays it is a mix of C, C++, .NET, COM, WinRT, depending on the subsystem.
On PC, MS-DOS did not use C, rather interrupts and there was no common C ABI.
On OS/2, a mix of C ABI and SOM, with C, C++ and Smalltalk as main languages.
Windows started only with the C ABI, nowadays it is a mix of C, C++, .NET, COM, WinRT, depending on the subsystem.