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There are SD cards with WiFi support
(upload.wikimedia.org)
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Things like this were huge back in the days of PDAs. They had SDIO ports specifically for expansion. I had one for Wifi and another for Bluetooth on my Garmin PDA, so I couldn't use Bluetooth and Wifi at the same time, and both kept you from having non-volatile storage. If your battery died, your system was wiped because all the storage was in memory.
I got a Dell at the very end of the PDA era (the iPhone was already out, but was still ATT exclusive) that was super fancy because it had a CF card slot AND an SDIO port, so I could store data AND use my SDIO digital camera.
Was it the Axim x50? That was a fine looking PDA. I had an Axim x30 and loved it to death. Its death. Then, I got an IPAQ 210. They didn't have any good accessories for that one. No clip on thumb keyboard or anything.
I don't remember the model at all. I didn't use it very long, as I ended up getting a Blackberry a few months later, and between it and my laptop I really didn't need a PDA.
I used the Garmin iQue m3 for years though, since I had it earlier and it had a pop-out GPS antenna that kept it useful as a navigation tool in the car well into the 2010s.