The History of Computers By facebooker_1235430349 Oct 31, 1834 Charles Babbage designed the Analytical Engine (1st automatic calculator) Mar 31, 1936 Konrad Zuse created the Z1 (mechanical calculator) Jan 31, 1944 Harvard Mark ! was completed Jan 31, 1975 Announced debut of Altair 8800 Apr 1, 1976 Jobs and Wozniak officially formed the Apple Computer Company Jan 27, 1977 Commodore introduced the PET Apr 22, 1977 The Apple II was born Dec 8, 1977 Disk Operating System (DOS) was introduced and developed by Wozniak Jul 27, 1978 Disk II was introduced Jun 30, 1980 Apple III was released Apr 17, 1981 The Osborne Company introduced the first portable computer the Osborne Jan 12, 1983 Lotus 1-2-3 went on the market Sep 30, 1985 Miscrosoft Excel goes on the market Jan 31, 1993 Mossaic (web browser) introduced Jul 31, 1994 JIm Clark developed the Netscape web Browser Jun 30, 2013 ENIAC was created by Mauchly and Eckert