In your Quiz04, only preserve R11 on the stack. In particular don’t preserve R14, since is the output register according to the contract. If you preserve it (push in on entering the subroutine and then pop on return) then you will clobber your output and won’t get any output when you return from the subroutine. So, only preserve R11 in your subroutine, no other registers.

Names appear in the memory browser only if you have a PC and you have downgraded your compiler.

See the following documents on our website (Lessons tab). It was covered in some early screencast, forgot which one.

Downgrading Compiler

UpgradingTheCompiler_ForMacUsers

In my opinion, it is not worth the trouble to downgrade the compiler. First, you can only do it if you have a PC, second, all it gives you is that you can see the names of the variables in the memory browser. The cost is that you are using a very old compiler without the latest patches and updates.