"Imagine a portable device that runs on 4 AA batteries & runs for 20 hours+, has an address book, a date book, a notepad-like app, a built-in modem, a full-travel keyboard, a terminal application, even the ability to connect to a modern Windows or Linux based PC & transfer files. Sounds great doesn't it? But in 1983?" Great review of the Radio Shack TRS-80 Portable Computer.