In 1981, Osborne Computer introduced the world's first portable computer -- the Osborne I. Weighing almost 24 pounds, the Osborne I wasn't very portable by today's standards, but it was light enough to carry and could fit under an airplane seat. The Osborne I, which sold for $1,795, came with a 5-inch display, modem port, two 5 1/4 floppy drives, battery pack, and 64 kilobytes of memory.