One was a Sharp IQ-8400 Electronic Organizer that was the sole "computing power" for my consulting business in the early/mid 1990s - until I eventually bought a Windows PC. The other was an IBM WorkPad c3 (a re-badged Palm Vx) that was given to me by IBM after I had put some business their way, and I relied on this for a few years from 1999 onwards.
Looking at the IQ-8400 made me wonder (apart from how primitive my current smartphone might seem in 20+ years!) what other people's first piece of personal technology was - perhaps the thing that made you a "geek" - and whether you still have it. Anybody want to share?