The Osborne 1 was essentially first commercially successful portable microcomputer, which its public debut on April 3, 1981. Weighing in at 23.5-pounds, this “Personal Business Computer” cost $1,795 USD, used the CP/M 2.2 operating system, and was powered directly from a mains socket as it had no on-board battery. The computer shipped with a large bundle of software that was almost equivalent in value to the machine itself, a practice adopted by other CP/M computer vendors. Continue reading for more cool vintage computer ads. Click here to view the bonus ads.