| 摘要 |
PURPOSE:To reduce the fatigue of an operator as well as to increase productivity of characters, by securing the function of a space key for a bar key when it is operated independently and the function of a shift key for the bar key when it is operated along with the keys of characters, symbols, etc., respectively. CONSTITUTION:A keyboard part 10 includes a key group 11 of characters, symbols, etc. plus a bar key BK. The key BK is located at a position where it is easily operated by the operator's front thumb. A key scan/detection encoding circuit 12 scans each key within the group 11 and applies the code signal of the pressed key to an input A of a simultaneous keying processing circuit 13. An encoder 14 applies the code signal shown by the BK to an input B of the circuit 13 in response to the keying of the BK. The circuit 13 decides whether the key of the group 11 and the BK are hit simultaneously. In the case of the simultaneous hit, the value of the key code applied to the input A is converted into the value of a shift mode to be delivered to a key code bus X. In case a simultaneous hit is not decided, the code of the input A and the space code of the input B are delivered directly to the bus X. |
