Here's a working 3com ftp mirror from my bookmarks. I verified a few pdfs. If you can't find a file, arrow back to the older mirrors.
https://web.archive.org/web/20120724033845/http://www.mirrorservice.org:80/sites/ftp.3com.com/pub
>
ftp://ftp.hs.uni-hamburg.de/pub/mirrors/3com_nic/
>> Post by Louis Ohland
>> The brute force resembles that. Go to the Internet Archive,
>>
www.3com.com, go to when the product was still active or supported, find
>> the file in question, and if it isn't a pdf, then it will probably be on
>> the FTP site. Take the file name and go surfing.
Post by *@
gmail.com
Post by William R. Walsh
>>> I grabbed a copy not long before the darkness fell.
>>> As best I've been able to tell, HP simply didn't save a *lot* of stuff.
>>> E-mail coming your way.
>>> William
>>> "Louis Ohland" wrote in message
>>> Post by Louis Ohland
>>> HP has a support site that is worse than IBMs.
>>> I don't know if this will work - browsing via Google Groups, via a
>>> search for a particular that was on 3Com's FTP. Is there a publicly
>>> (or other) available mirror?
>>> Thanks.