The information is sent on a regular TV signal and occupies the vertical blanking-portion. Unlike cable systems, which provide a continuous scroll of information, the IRIS system allows the viewer to select any page at random. IRIS contains some 150 pages of information covering weather, agriculture markets prices, television schedules and a continuously updated news service staffed by CBC editors. Microfirms jockey for a hit disc INDUSTRIAL wrangling over a new type of small floppy disc for storing data is holding up the development of useful portable computers. At least six types of microfloppy, as the discs are called, of varying size and format are competing for the market. One thing the microfloppies have in common is the fact that they are all under 10 cm in diameter, making them better suited for briefcase-size computers than the existing 5-inch (12-5 cm) and 8-inch (20 cm) diameter floppy discs. There the similarity ends. Sony, which has been furiously lobbying