Electronic typewriters with limited memory or basic text-editing functions that operate as standalone typing devices — not as computer input peripherals — generally fall within this heading. Devices that function primarily as computer keyboards or printers would be classified elsewhere. The key criterion is whether the device's primary function is autonomous text input and printing rather than serving as a peripheral to a separate computing system.

A dedicated word-processing machine is a self-contained device designed exclusively or principally for text creation and editing, without the general-purpose programmability of a personal computer. Once a device can run third-party software or perform general data processing tasks, it typically migrates to the automatic data processing machine heading. The distinction has become increasingly narrow as technology has evolved, making a classification review advisable for borderline devices.