| 摘要 |
<p>PURPOSE:To provide the keyboard input device which requires any special controller. CONSTITUTION:A decoder 9 outputs a control signal 2 with an address signal 8 and a read signal 7. A gate 3 is opened with the control signal 2 and values based upon the ON/OFF states of key switches are outputted from data signal lines 5 and 6. The signal line 6 is connected to a data bus and an output signal by the signal line 6 can be obtained at a location specified by the address 8.</p> |
