Yet another of IBM’s diversification from which much was expected, its six-year-old IBM Instruments Corp in Danbury, Connecticut has turned to ashes, and it will be disbanded over the next six months; the 150 employees will be offered other jobs. The unit, which spectacularly failed with its CS9000 68000-based instruments computer, was formed to help IBM penetrate analytical laboratories. IBM’s stake in two instrument makers, Bruckner Instruments and Spectrospin, have been sold to the shareholders of those firms, and Bruckner, Billerica, Massachusetts, will market their equipment.