Osbourne 1

The Osborne 1, released in April 1981, was the first commercially successful portable computer, designed by Adam Osborne and manufactured by Osborne Computer Corporation. It featured a 4 MHz Zilog Z80 processor, 64KB of RAM, and ran the CP/M 2.2 operating system. The system included dual 5.25-inch single-density floppy drives and a 5-inch monochrome CRT display, capable of showing 52 × 24 characters. Housed in a rugged ABS plastic case with a built-in keyboard, the Osborne 1 weighed 24.5 pounds, making it a "luggable" rather than a truly portable device. Despite lacking an internal battery, it was marketed as a transportable business machine, bundled with a suite of productivity software valued nearly as high as the computer itself. The Osborne 1’s affordability and portability helped define the early personal computing market, though competition and financial missteps led to its discontinuation in 1983.

I bought this computer at an Austin, Texas Goodwill thrift store for $10 in circa 2011 when Goodwill used to have a computer museum showcasing rare and unique vintage computers that came through their donation stream.