Color image of the EMASS Datatower control unit. This image shows two views one from the front and another from the rear with back cover removed to show circuit cards. Paper label verso " The EMASS(tm) ER90(tm) high-density, high capacity helical scan tape drive reads and writes data at 15MB/sec -- five times faster than 3480 technology. To ensure reliablility, the ER90 recorder has been engineered to perform with just one error event within 10(-13)/"