QNX elvis editor seems to be acting weird in a ksh terminal session running over serial port. It sort of works, at least
 you can open/edit/save text files etc. But you can't scroll through the text buffer. When you open an existing text 
file it shows only the first line. Up/down keys do nothing. The more tricky way with 1Ctrl+D scrolls one line down as 
expected. However 1Ctrl+U scrolls one line down too, i.e. now way to scroll up at all.

On the other end is a standard 'screen' terminal emulator. 

Any ideas?

Thanks.