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Osborne 1

Early portable microcomputer / From Wikipedia, the free encyclopedia

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The Osborne 1 is the first commercially successful portable computer, released on April 3, 1981 by Osborne Computer Corporation.[1] It weighs 24.5 lb (11.1 kg), cost US$1,795, and runs the CP/M 2.2 operating system. It is powered from a wall socket, as it has no on-board battery, but it is still classed as a portable device since it can be hand-carried when the keyboard is closed.

Quick facts: Also known as, Developer, Manufacturer, Type,...
Osborne 1
Also known asOCC-1
DeveloperAdam Osborne
ManufacturerOsborne Computer Corporation
TypePortable computer
Release dateApril 3, 1981; 41 years ago (1981-04-03)
Introductory priceUS$1795 (today $5350)
Discontinued1983 (1983)
Operating systemCP/M
CPUZilog Z80 @ 4 MHz
Memory64 KB RAM
StorageDual 5¼-inch, single-sided, single-density floppy drives (optional dual-density upgrade)
Display5″ monochrome CRT display
Power37 watts max
DimensionsW: 20.5 inches (52 cm)
H: 9 inches (23 cm)
D: 13 inches (33 cm)
Mass24.5 lb (11.1 kg)
SuccessorOsborne Executive

The computer shipped with a large bundle of software that was almost equivalent in value to the machine itself, a practice adopted by other CP/M computer vendors. Competitors quickly appeared, such as the Kaypro II.