The Osborne 1 was the first commercially successful portable microcomputer, released in April, 1981 by Osborne Computer Corporation. It weighed 23.5 pounds (10.7 kg), cost US$1795, and ran the then-popular CP/M 2.2 operating system. Its principal deficiencies were a tiny 5 inch (13 cm) display screen and single sided, single density floppy disk drives whose disks could not contain sufficient data for practical business applications. Its design owed much to that of the Xerox NoteTaker, a prototype developed at Xerox PARC in 1976.
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