Abstract: An electronic calculator with a check function has at least two display parts. A calculating formula inputted with keys is continuously indicated on one display part. At the same time, operated result data corresponding to the data indicated on the one display part is indicated on the remaining display part. Some data of the inputted calculating formula may be amended during the display and replay of the formula, and the corrected final result data is indicated on the display.

Abstract: An electronic game apparatus having a display unit which is capable of displaying at least a series of numbers and decimal points the number of which is equal to the number of the series of numbers. Among the numbers, any number part of which is not displayed is defined as a target. The target is shifted toward one direction. With one of the function keys, a missile the shape of which corresponds to the non-displayed portion of the target is shifted toward a direction opposite to that of the target. When the non-displayed portion of the target is hit by the missile so as to complete the figure, the decimal point in an effective firing range (display frame or digit) where a missile digit and a target digit coincide disappears. Thus, points are made. The game continues until the missiles which have been given at the start of the game are used up. Points at each stage are added and final score is displayed when the game is over.

Abstract: When a key of a key-in section is operated and when an operation unit produces the result of operation, a display is performed on the basis of the keyed-in data and the operation result data stored in the memory unit, while at the same time the notes corresponding to the data are sounded under control of a sound control circuit.

Abstract: A calendar data display controller may display the calendar of a desired month with various calendar data in a calendar display section which is provided in a display unit, together with a numerical data display section for displaying numerical data.The calendar is displayed in a given format in a manner that, in accordance with an instruction given by depressing a CAL key provided on a keyboard for instructing a calendar display, data is prepared representing specific calendar data such as data representing the date corresponding to a specific day (for example, Sunday) of the week and/or a holiday, a day set by an operator, today, and the day as a result of date calculation, and the prepared data is sent out to a display drive unit.

Abstract: An electronic calculator with a time counting function has an input section for inputting various data control signals. When the input section inputs given data or control signals, a given calculating operation is performed in a calculating circuit in accordance with these input signals under control of a calculating control circuit. The electronic calculator comprises an oscillator for outputting a reference frequency signal, a frequency dividing circuit by which an output signal from the oscillator is frequency-divided to produce a given time counting signal, and a time counting circuit in which a time counting operation is executed by the time counting signal from the frequency divider. A holding circuit for holding a time counting signal from said frequency divider is inserted between the frequency divider and the time counting circuit.