| 摘要 |
PURPOSE:To secure a high-speed and automatic detection for the idle line, by adding a logic circuit to the CPU in the circuit which detects the number of the unused channel among several channels and then allots it for the data communication or the like. CONSTITUTION:In case the output contents of the memory 2 of the address and shown by the output of the counter 1 is ''1'' indicating the under-busy state, the value of the counter 1 is counted up. On the other hand, in case the output contents of the memory 2 is ''0'' indicating the nonbusy state, the FF3 is set to indicate the detection of the unused channel. Thus a high-speed and automatic detection is possible for the idle line by reading the output of the counter 1 while the FF3 is set. |
