Hi Darryl,
thank you for trying to help, but after another three days of trying, changing bytes, switching bits, I am pretty sure that my LCD doesnt meet HD44780 specs for 100%.

Your code does exact the same as mine did before.

So I managed somehow to print out some chars, wich makes me sure:
1. the LCD switches to 4 bit mode
2. the wiring is right

but I could'nt use the 2nd line, nor some other commands.

the next thing I tried was to connect the LC display directly to the pic without the stack - just the same.

and then I tried to write stuff with the LCDOUT command - nothing.

Now I ordered some other LCD's wich are used by other people before (LCD1602). Next week I'll see what happenes.

Again, thanks.