Manufacturer: Sinclair
Launches: 1981
Manufactured in United Kingdom
CPU: Zilog Z80 @ 3.25MHz
Memory: 1 KB ~ 64 KB
Hard drive: None
Operative System: BASIC

The successor and improved version of the ZX80 was the lowest-priced computer of its time and was sold in kit form for 49.95 pounds sterling, and for 69.95 assembled.

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Manufacturer: IBM
Launches: 1981
Manufactured in USA
CPU: Intel 8088 @ 4.77MHz
Memory: 16 KB ~ 640 KB
Support: Diskette 5¼"
Hard drive: None
Operative System: PC DOS

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Manufacturer: Xerox
Launches: 1981
Manufactured in USA
CPU: AMD Am2900
Memory: 384 KB ~ 1.5 MB
Hard drive:
Operative System: Pilot
Innovations: It was the first personal computer to be sold with a graphical user interface, mouse, Ethernet network, and laser printer.
It was a sales failure, with only 25,000 units sold.

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Manufacturer: Osborne
Launches: 1981
Manufactured in USA
CPU: Z80 @ 4MHz
Memory: 64 KB
Support A: Diskette 5¼"
Support B: Diskette 5¼"
Hard drive: None
Operative System: CP/M 2.2

The Osborne 1 was the first commercially successful portable microcomputer.
It weighed 11 kg, cost US$1,795, and ran the then-popular CP/M 2.2 operating system.

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