The Osborne 1 was the first widely accepted portable computer that included a monitor, disk drives and all components. However, it did not include a battery and required plugging in to a mains socket. A battery pack later became available which offered one hour of usage. The Osborne 1 was introduced in 1981 at the West Coast Computer Faire.
The portable computer was based on the Z80A CPU which ran at 4MHz, had 64K RAM and 4K ROM, a 5-inch display screen, two 5.25-inch floppy disk drives and a detachable, full-sized keyboard. It also features IEEE and RS-232C interfaces. The Osborne weighed 24 pounds (10kg) and ran the CP/M operating system. It sold for $1,795, which included Micropro's Wordstar software.
The Osborne 1 was very popular. In 1982, over 125,000 Osborne computers were sold and in 1983 Osborne announced that it would produce an IBM compatible portable computer, to be called the "Vixen." However, Compaq Computers beat Osborne to the market with their own IBM compatible machine. Osborne 1 sales dropped off as people waited for the "Vixen" and Osborne Computers went into bankruptcy, and never recovered the market share for portable microcomputers.
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