IBM 3270 - Models

Models

The IBM 3270 display terminal subsystem consisted of displays, printers and controllers. Optional features for the 3275 and 3277 were the selector-pen or light pen, ASCII rather than EBCDIC character set, an audible alarm, and a keylock for the keyboard. A keyboard numeric lock was available would lock the keyboard if the operator attempted to enter non-numeric data into a field defined as numeric. Later an Operator Identification Card Reader was added which could read information encoded on a magnetic stripe card.

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