Definition: portable computer

A lightweight computer that can be easily transported. Portable computing started in 1981, when Adam Osborne introduced his CP/M-based business computer called the Osborne 1. It came bundled with a modified version of the WordStar word processor specialized for the machine's small screen. With two floppy disks for storage, its RAM memory was a whopping 64KB.

The Osborne 1 was soon followed by many other CP/M machines, including Kaypro, Hyperion and Otrona. One year later, Compaq introduced the first MS-DOS portable. See CPM, Osborne 1, laptop and notebook.

The Osborne 1

For $1795, all 30 pounds of the Osborne 1 came bundled with WordStar and other software. Its 5" CRT screen was only for text. (Equipment courtesy of Alfred J. Young, Danboro, PA.)

The Otrona Attache

Not for the masses, the Otrona Attache was half the weight of the Osborne but three times the price. Although a monitor was often plugged in for desktop work, its small text-based screen was very usable. Only about 5,000 Attaches were made.