IBM 1620 computer and 1621 paper tape reader, Norwich University, Vermont, ca. 1962. The IBM 1620 was jokingly nicknamed CADET (“Can’t Add, Doesn’t Even Try”) by its users, in reference to its use of addition tables in memory instead of dedicated addition circuitry.
Shown here is the control console of the NORC. Switches can be used to start and stop the machine and to modify the written program. In normal operation, however, the calculator proceeds automatically according to instructions, recorded on magnetic tape, without control by th eoperator. Any number or instruction in the calculator can be shown on the faces of cathode ray tubes, at left. Selected portions of the program also can be examined in slow motion through this display.