| 摘要 |
PURPOSE:To eliminate the need for jumper setting by the type of a device and to facilitate support and maintenance by providing a counting circuit which counts the number of magnetic heads and a microprocessor which recognizes the kind of the device based on the information and informs the recognized result to a host system. CONSTITUTION:At the time of entering the power source of the device a control part 1 including the microprocessor selects a head number zero and transmits the information to a decoder 2. There, signals from the control part 1 are converted into the signals corresponding to the respective magnetic heads and the signals are transmitted to the respective magnetic heads 4 through head select lines 7-11. But all the head select lines do not have the heads concerning the type of the device. Then a head detection part 3 is provided on the head select line and checks if there is a head actually so as to return the information to the control part 1 through a head check line 6. Based on the information, the control part 1 decides whether or not the next head should be selected and also decides the type of the device according to the number of heads after a series of actions.
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