[tptacek]

These aren't true of MSP430 or AVR, both of which are RISC-ish designs. Also, you still have to save the link register inside functions that call other functions. I also didn't explain SPARC register windows. :)

But hopefully these nitpicks aren't so much "annoying" as they are an example of how little you need to know to follow a discussion about super nitpicky details of different architectures. AVR has a general-purpose programmable condition flag 'T' in its status register. What do you do with the 'T' flag? I'unno, but hopefully the basic idea makes sense after not- too- much reading!