Re: Undo

[Stefan Monnier <monnier@iro.umontreal.ca>]

> C-_ is binded to DEL 

Try C-x u
or C-/

C-_ is a convenient binding but not all text terminals accept this
key combo (they won't beep at you, but they might send some other
code to Emacs, such as DEL in your case).
C-x u is the safest binding, but it's not too convenient, so you
can try C-/ as well.

In case C-/ doesn't work either, then choose a binding you like
and put (global-set-key <thebindingIlike> 'undo) in your .emacs.

If C-x u doesn't work either, then there's something really wrong
with your Emacs setup.


        Stefan


PS: M-x undo does not do quite what you want, indeed.  You might want
    to report it as a bug, but I'm not sure it'll be treated as such.