this post was submitted on 19 Nov 2024
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Mildly Interesting
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Most of them act(ed) like an access point.
However, the SDIO spec allows for cursed applications like WiFi adapters, Bluetooth dongles, and more to be fitted into an SD card. It was really just SPI, so in theory it also allowed things like GPS tranceivers and any other peripheral you can think of that's low bandwidth enough to work over SPI. Need Bluetooth for your Palm PDA? Here you go! Just stick a massive slab of plastic into the SD card slot!
These days SDIO is only really used for alternative (faster) transfer modes and maybe some slow and insecure WiFi access points in cameras.