In message <C4F5B6AD-59EA-11D6-A075-0050E420D957@ucsd.edu>, John Clark writes:
>
>
>Ed does not use fancy screen controls, repainting the window required
>some large set of characters to be sent down the line, etc.
>If you wish to list out some lines you may do so, but it is not required
>to execute some ed commands...
>
>I've used ed on a 300 baud line, I think I would recommend
>9600 as the minimum for vi...
>

Indeed.  In fact, there are (or at least were) adaptations to slow 
lines in vi -- you could tell it to display only a few lines, rather 
than the full screen, depending on baud rate.  (I'm speaking of the 
original vi, not the current version.)

		--Steve Bellovin, http://www.research.att.com/~smb
		Full text of "Firewalls" book now at http://www.wilyhacker.com