I am running dosbox on a virtual windows 8 on mac. some of my keyboard characters doesn't work for exemple : ,] ,\. I tried using the guide- did not work and i can't open key mapper, -startmapper cause illegal commend. tried as well to disable f keys. please help.

I am running dosbox on a virtual windows 8 and some of my keyboard characters doesn't work for exemple : ,] ,\. I tried using the guide- did not work and i can't open key mapper, -startmapper cause illegal commend. please help.