The document outlines the key developments in computer history from ancient calculating devices like the abacus to modern personal computers. Some of the earliest developments included the abacus (3000 BC), Pascaline mechanical adding machine (1642), and punched cards for data storage in the 1800s. Major milestones were Charles Babbage's analytical engine (1830s), the first general purpose computer Mark 1 (1944), the electronic ENIAC (1946), and the first commercial computer UNIVAC (1951). Personal computing began with the Apple II (1977) and IBM PC (1981) which led to portable computers in 1987 and multimedia desktop computers in the 1990s.