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The HP was the first handheld device running a full version of DOS. HP had a full line of accessories that could turn the 100LX into a complete computer. This was one of the first handheld devices that was a full programmable computer. It is still available on eBay.
James Kendrick of ZDNet Mobile News takes a trip down memory lane to showcase the most important mobile gadgets he has owned.
The Palm xv was the PDA that cemented Palm's dominance in this new device category. With the pictured Omnisky modem snapped onto its back, the Palm xv became the first handheld device with a connection to the new thing called the Internet. This combination was the first handheld method to get email on the go. I was one of the first mobile professionals able to get and respond to email from anywhere, thanks to the Palm xv and Omnisky modem. The data connection provided by the Omnisky was insanely slow and tremendously expensive, but it was the first of its kind.