There are five flavors of pendant that I know of...Neal can correct me if I'm wrong here. The 88, 88hs, and 32mp. The agusta is their brand new one than there are the siemens variety. The controller update is a big pile of cards that replaces everything in the main card enclosure, xyz cards, spindle controller, interface card etc. The pendant is just the control interface, the keyboard and screen, with the upgrade kit the only thing that gets replaced in the pendant is the keyboard pcb card.
I have the 32mp, just an 88hs with a built in PC from what I can tell.
http://www.cncpros.net/
If you need a new controller or parts (like new screws) check these guys. I've bought lots of stuff from them and never had any problems. They have used stuff too, and memory upgrades. A new pendant from Fadal may run 10k or more, look for one used for sure.
Another great source for info and parts is Fadal itself, Neal there is tech support is a really nice guy and helped me out many times.
If your pendant is working then adding a floppy should be pretty easy,
never done it but I cant imagine it's too tough. Open that pendant up and look through the documentation on pendants on Fadals site. There may be a plug just sitting there waiting for a 20$ floppy drive. And the documentation for your sweo
drive is in there in the maintanance manual if I remember right...on Fadals site.
Don't let the bumps in the road get you down...after you get all of the issues addressed you'll have a really sweet setup.
The good news about your mill is that you can still upgrade everything and replace everything. Parts have been very easy to find. CNCpros has those CRT's cheap by the way.