The first portable computer was known as Osbone 1 which was developed in 1981. The first portable computer was known as Osbone 1 which was developed in 1981. This heavy and cumbersome machine used CP/M operating system which means Control program monitor who was commonly used in 1970s before the MS-DOS wiped it out after the introduction [...] Related Articles: How to Revive a Dead Laptop Battery Bring a seemingly-dead laptop battery back to life. It could... Three disputable issue