Automatic screen blanking in a mobile radio data terminal

DETAILED DESCRIPTION In one aspect of the invention a data processing device with integral visual display is provided which includes automatic screen blanking during vehicular motion and wherein means for detecting such vehicular motion is effected so as to deactivate the visual display as well as the associated keyboard input capability, and wherein any incoming message received by the data terminal during which its display screen is so deactivated results in an audible alert effective to indicate the receipt of a message and the nature thereof in accordance with the type of the alert or, alternatively, with predetermined indicators or information stored in the data terminal itself.