I already tried that :( That's what I thought first so I downloaded the compiler but it doesn't recognize the inline assembly part.
There is also another "hint" that maybe somebody recongnizes.
Sometimes the makefiles are related to the development tool used. I noticed the use of "!if" and "!endif ...

I almost forgot (maybe you noticed). I'm looking for a C compiler not an assembler. The code that I wrote in the previous code is in C files. I guess (almost obvious) ".asm" is a compiler directive of "that compiler" I'm looking for

I'm currently trying to perform maintenance on a bunch of code that to me was completely unknow until a few days ago. While looking around I think the code corresponds to a 65816 machine (which is part of the 6502 family right).
The code was developed by a third party company which has been ...