Synthetic Human Agents for Modeling and Simulation

A miniature calculator is provided with a keyboard having a small opening which has a recessed operating switch which may be pressed by the user. The operating switch is recessed so that accidental operation of the switch is difficult. When the calculator is turned on and the button is pressed, the calculator will turn off. When the calculator is off, and the button is depressed for less than 2 seconds, the calculator will turn on. If the calculator is off and the button is depressed for longer than 2 seconds, the calculator will switch off after the two second delay, since this is an apparent accidental depression. A logic circuit controls the connection of a regulated power supply to the calculator circuitry in accordance with the condition of the push button in the keyboard. The regulated power supply is a current supply which contains circuitry which eliminates the "low end" problem wherein regulated output voltage is provided even after substantial decrease of the battery voltage. The calculator also has a display time-out circuit such that the numerals of the display flash on and off at a relatively short duty cycle of, for example, 2 percent, after the display has been on for a given time in order to conserve battery power. A low battery voltage circuit is also provided to cause the flashing of a dot in the display.

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