Correction:
/cuted here/
>...
>DON'T PRESS [enter]! Stay at the end of y1 function!
>Now press
> [2nd] [mode] [graph]
^^^^^^^^ Sorry, I forgot this :]. (See my previous message!)
> hold [<-] or [->]
>What you can see is how function y1 is stored in the RAM.
>I looks something like 3Z.@#%#.
/cuted here/