L)ength of page.   You can set the scroll page length with the "L"
command. The scroll page length is the number of lines that will be
displayed on you screen before halting. "L" is typically set at 23
lines per page when you first log on.  

You will be asked for the page length after you give the "L" command.  
You can produce a continuous scroll on your screen by entering a 0.
Then your screen will not pause when it is full.
 
