| 摘要 |
PURPOSE:To enrich the monitor contents compared with the monitor with only a display device by driving a buzzer with a user program and therefore attaining the acoustic monitor. CONSTITUTION:A drive circuit 8 for a buzzer 23 is provided at the side of a prescribed output port of an output circuit OUT7. The circuit 8 consists of a transistor 81 and an OR circuit 28. The OUT17, for example, is supplied in the form of plural signals to the circuit 82 from the circuit OUT7 via a single-shot circuit SS together with the OUT16, the key sequence mistake signal and the keying control signal. The optional signals such as the OUT17 and 16, etc. which are produced at the user program side are supplied to the circuit 8 in addition to the conventional key sequence mistake signal, the keying sound generation signal, etc. Thus the buzzer 23 can be applied to various types of monitor. |
