I designed the Terbonet clone card (just setting the credibility here
)
The driver software was built into the S1 software load (which is where I got the source code to reverse with) so you don't need any CD to get basic connectivity and to use the ,#401 backdoor to enable the network card. You may want to add the networking utilities by 'hacking' your TiVo so you have access to ftp, telnet, TivoWEB, etc. but that's another story (maybe they'll be included in the altepg image?). Installing it should be as easy as removing the case, slipping the card onto the plated header, attaching a network cable and feeding the end back out of the box. Jim Main did a nice photoshoot when he was distributing Terbonets in the UK (attached).
You don't need extra memory for the basic network card. You could upgrade the mainboard memory to make a loaded TiVo respond faster via the UI, but those chips are now impossible to find, and they were a PITA to install by hand too. The CacheCard (Turbonet's big brother) would take a DIMM of up to 512MB if I recall.
Take standard electronic precautions, don't install the card on a dry day in shag carpeted room! Keep yourself grounded, don't work with the cover off and the plug in, don't touch electrical contacts of the main board, nor the network card.
FYI This file was archived here:
http://ca.groups.yahoo.com/group/terbonet/files/ D.
PS you don't have to get as fancy with the network jack, I used to just run my cable out a cooling hole near the fan (yes I had to recrimp a new connector). Tin snips will work in a pinch...if you are in a hurry...but watch for metal filings left inside!