[en] The program EAA.BAS controls the operation of the Electrical Aerosol Analyser (EAA), the reduction of of the data using the Twomey iteration algorithm and the output of results in tabular or graphical form. It has been written from first principles, although it resembles the TSI software for the Apple microcomputer. EAA.BAS operates with a series of menus, from which the user can selection option(s) in order to operate the EAA, process raw data into size distributions and store/retrieve data files. (author)