telnet/comint has trouble sending input Emacs 21.1

[Steve Yegge]

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In GNU Emacs 21.1.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2001-10-24 on stevey
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Using telnet to connect to certain telnet servers doesn't
let you send input.  Example:  telnet dr.nostrum.com 2000
(a text MUD game) and try to enter a name.  You'll get
a ^M character when you press Enter.  I tried using an older
version of telnet.el, and then an older comint.el, but they
both exhibited the same problem (although they work for me
under Emacs 20.5.1).  Alternate server with a different
telnet server engine that also exhibits the problem:  
telnet opal.cabochon.com 2000

Please accept my profuse, grovelling apologies if this is
already a known problem, or my bug report is lacking or
inappropriate in any way.

Recent input:
C-n C-n C-n C-n C-n C-n C-p C-p C-p C-p C-e C-n C-n 
C-n C-n C-a C-n C-p C-x b * s h SPC <return> c d SPC 
l i b <tab> s p e l l s <tab> <return> l s <return> 
C-x RET a p r o p <tab> <return> b u g <return> C-x 
o C-n C-n C-n C-n C-n C-n C-n C-n C-n C-s s u b m i 
t C-a C-s C-s C-s C-s C-s C-s C-p C-p C-p C-a <return> 
C-x o C-x 1 C-x RET r e p o r t <tab> <return>

Recent messages:
No goal column
Completing file name...
Completed
Completing file name...
Completed
/games/wyvern/lib/spells 
Fontifying *Apropos*... (regexps........)
Mark saved where search started [2 times]
Type C-x 4 b RET to restore the other window.  C-M-v to scroll the help.
Loading emacsbug...done