| 摘要 |
A picture showing the key arrangement on a keyboard (12) is displayed on a display unit (CRT) according to the requirement for diagnosing the keyboard, a code generated by depressing a key is discriminated, a key indication corresponding to said code is cancelled, and a key that remains displayed even after all of the keys are depressed is determined to be abnormal. Further, when there exists no key indication that corresponds to a code generated by depressing a key, then the key is determined to be abnormal. |
