Osborne 1 Portable Computer, 1981.
The Osborne 1 was the first commercially successful portable microcomputer(but needs external power source), 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.
It have had a very small built-in screen (8.75 x 6.6 cm, which could display 128 columns!!). The first models couldn’t display more than 52 columns by line, so to access to the 76 other columns, the user had to scroll among the screen thanks to the cursor keys.
