| 摘要 |
PURPOSE:To prevent generation of missing of information by raising an electronic tone from an electronic tone generator of a console when the idle state of a storage area reaches a designated area or below so as to inform the state to the operator. CONSTITUTION:An external storage device 4 is provided with a storage area 5 storing a message and the console 6 is provided with the electronic tone generator 7. In outputting a message to a console CRT 3, a computer 2 outputs the message to the console CRT 3 and stores it to a storage area 5 of the external storage device 4, and the computer 2 supervises whether or not the idle state of the storage area 5 reaches the designated area or below is supervised by the computer 2 every time the message is stored in the storage area 5. When the idle state of the storage area 5 reaches the designated area or below, a command is outputted to the electronic tone generator 7 of the console 6 to generate an electronic tone. The operator can know from the electronic tone that the idle state of the storage area 5 reserving the message of the external storage device 4 reaches the designated area or below.
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