| 摘要 |
PURPOSE:To improve the reliability of confirmation of connection between a cassete and a holder and to prevent a bubble memory from malfunction by connecting cassette insertion detecting circuits to signal terminals of the holder. CONSTITUTION:The cassette insertion detecting circuits 18-20 are connected to output lines 15-17 of a function driving circuit 11 which are connected to connection terminals 64-62 on the holder la side. Only when all the terminals 61-65 of the holder are contacted with cassette terminals 51-55 respectively, a cassette insertion detecting signal is applied to a control circuit 10. In this case, current flows from a power supply Vcc to an output source 15 through the terminals 65, 55, a function gate 12 and the terminals 54, 64 and base current is supplied to a transistor (TR) Q1, so that the TR Q1 is turned on. Consequently, the potential of the collector is reduced, a TR Q2 of which base is connected to said collector is turned off and the collector of the TR Q2 is turned to the high level. |
