Stack-overflow

   Whenever TV detects that the stack is growing smaller than 2k, the
   executing command is terminated. TV itself will remain active. This
   means, that the stack-overflow is only expected; it does not really
   occur. Note, that this message applies to the system stack only; it
   has nothing to do with the stacks associated with registers. These
   are obtained from the global free memory list, not the system stack.