Although the Altair itself was only a mild commercial success, it helped spark a huge industry. Home computers By 1977, the introduction of the second generation, known as home computers, made microcomputers considerably easier to use than their predecessors because their predecessors' operation often demanded thorough familiarity with practical electronics. The ability to connect to a monitor (screen) or TV set allowed visual manipulation of text and numbers. The BASIC language, which was easier to learn and use than raw machine language, became a standard feature. These features were already common in minicomputers, with which many hobbyists and early produces were familiar. In 1979, the launch of the VisiCalc spreadsheet (initially for the Apple II) first turned the microcomputer from a hobby for computer enthusiasts into a business tool. After the 1981 release by IBM of its IBM PC, the term personal computer became generally used for microcomputers compatible with the IBM PC architecture (PC compatible). See also History of computing hardware (1960s–present) Lists of microcomputers Mainframe computer Market share of personal computer vendors Minicomputer Personal computer SFF computer Supercomputer Notes and references Microcomputer Computers