I wonder if this remote would work with a Performa 5215, as mine is equipped with an infrared sensor (as I am sure all of the 5200-series computers are).
Those remotes were used on
ALL the IR equipped Macs back in the day apart from the Mac TV. That remote will work with
any LC/Performa/Quadra 63x/64x, LC/Performa 580/588, or Performa/Power Mac 5xxx/6xxx.
You should. A dial-up modem is completely useless nowadays (as I have experienced with my 5215) & I am sure you could get high-speed Internet access on your 5400 (the requirements, from what I hear, are not too great. A friend of mine has an old Thinkpad hooked up to their router, and he's running Win 98, so anything is possible).
Those CommSlot modems were useless even back in the day - they're actually a
software based modem, just like the WinModems used in modern PCs today where the bulk of the work is done in software. On a fast, modern computer thats no big deal, but given that the Perfromas had a lot less power than modern computers, the extra overhead created by the WinModem used to really bog them down on the internet. And you also lost the use of the modem port - it wouldn't work and in fact on machines that shipped with a modem, there was a plastic plug covering the modem port to prevent you from using it. What a lot of people used to do to speed these machines up was to buy a proper hardware based external serial modem, pull the CS modem card and the plug covering the modem port, and plug in the external modem.
For the record, dialup internet sucks, but it is still somewhat usable, and a lot of people still use it...in fact for a lot of people it can often be their only form of internet connectivity available...I first got dialup Internet at home in 1998 and had it all the way up until 2009 when my finances finally permit me to upgrade to 3G broadband (ADSL isn't available where my parents live), honestly it was like going from a Daihatsu Charade to a Bugatti Veyron.