In our attempt to make the aid of a computer for the molecular biology laboratory available on a low-cost basis, we have improved the programs that we published recently. We have experienced in our laboratory, and have learned from others, that the average lab has an increasing demand to use a time-sharing-independent computer for the bulk of data handling. A microcomputer can give this independence. At the same time, a microcomputer can serve as a terminal for the few computer jobs, such as data communication or extensive search programs, which have to be conducted on a time-sharing basis. In this paper, we describe the programs which can be executed on a Apple II microcomputer using the Apple Language System. This system gives the researcher the opportunity to learn to handle sequence data, and it also includes a word processing system useful in writing letters and manuscripts and storing text.