emacs dialup query

[AGRE%MIT-OZ@MIT-MC.ARPA]

Often on a slow terminal it would be nice to have just a few lines around
the point redisplayed, like when line noise or notifications have messed up
the text.  Now, C-U C-L will redisplay the one line the point is on; what
I'd like would be to have C-U C-L (or say C-U C-U C-L or something similarly
quick to type) redisplay n lines above and below the point, where n is taken
from some init-settable variable.  Does a feature like this exist?  Is there
someone who wouldn't mind hacking the TECO?

Perhaps the Slowly library is the place to put such a thing.  As near as I
can tell from the documentation it doesn't.

 - phIl