[vidarh]

It has a 256 byte stack, no multiplication/division, and if you look at typical 6502 code, a lot of it tends to be self-modifying - e.g. modifying the location of the most-significant-byte of addresses to copy more than 256 byes for example. That's a reasonable-ish thing to do when you have tens of KB of RAM available and can easily keep track of everything that's going on. But it's not very C friendly. It's certainly possible, and there are multiple C compilers as well as compilers for other languages, but most of the machines it's used on are small enough that using assembler and some macros tends to be closer to the sweet spot.