Alot of code that called the BIOS still works, so to that level you got some basic platform compatibility, but then you end up thowing in code to use anything at the full hardware capacity. Then you could always include an assembler coded compiler and have most of the code in whatever compiler input you need. There really is no need to make entire programs in assembly. I did once, it was really small, and all it did was use the BIOS to print HEX from AX BX CX DX DS and ES. But a friend edited it to work with C++. I dont really know C that well myself so I am prolly gonna check out that area more.