C-_ on the console

[Brian White <bcwhite@precidia.com>]

When I hit C-_ ("undo") in an X window, it works fine.  If I hit it from
a console window, it does nothing and I have to hit C-- (no shift) for it
to work.  I tried "M-x describe-key C-_" but it doesn't even seem to notice
when I try to press C-_.

Any ideas?  I did a search on Google, but couldn't find anything about this.
Thanks!

                                          Brian
                                 ( bcwhite@precidia.com )

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