III Personal Digital Assistants (PDAs)
Personal Digital Assistant (PDA) computers are not PCs, which is probably why they're called PDAs and not PCs. However they are computers.
They don't have any sort of built in keyboard, and anything pretending to be a keyboard on the display is pecked at with a stylus. There are portable folding keyboards available to add on to the PDA.
Generally, PDAs are to-do list machines with contact data for your life. It is possible to get email on them, via a wireless modem, however these modems (typically) are much slower than desktop connections. RAM and other upgrades are available for these devices just as with any other computer.
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