Casio 7400gII

[Pälzer]

Hello,
i'm actually just a software user, but i'm currently trying my hand at programming Casio-Basic (Casio 7400gII; Casio 9860gII) and Sharp-Basic (PC 1403; e500).
I also own a couple of HP calculators; I use a HP 48sx daily in the office.

I have the following program:

Code:

   Lbl 1
   Cls
   RanInt#(1,7)->A
   RanInt#(1,16)->B
   Locate B,A, "Hello"
   Getkey != 47 => Goto 1

Unfortunately the program does not do what i want.
Before each loop the display should be cleared [cls].
Currently the calculator is cluttering up the display, which is not what i want.
Where am I making a mistake?
Can someone help me ?
Thanks a lot