I thought the system unit is imported automatically, and I don't have to care for it by list it in the uses clause. :S
It's good to know, thx. Now it still doesn't want to compile my program. (No prob with Hi and Lo now, but another error is occurred.) I'm trying to figure out the problem, and I'll write again if I can't find a solution.
uses system;
this unit gives specific BP compatibility functions,
in particular Hi and Lo: the ambiguity is solved by saying
Hi is the next to last byte (not the higher order byte).