Primary power: 100v, 120v, 220v, 240v (switch selectable); line frequency: 48-66 hz; provides 6 additional i/o slots & will accommodate all hp 9825 i/o cards; has an integral i/o card for connecting to the calculator; rack mounted (19 in.); 5.75 in. H, 16.75 in w, 0.75 in deep
