| 摘要 |
PURPOSE:To make signal input lines to be connected to a bubble memory control IC of one line without decreasing in control function by making a detection signal line for detecting the presence of cassette replacement and an ejection advance notice signal line of one line. CONSTITUTION:When a cassette is not mounted, switches (m) and (e) are off, and a cassette absence state signal H is inputted to a bubble memory control IC2 through a signal line 8. Then, when the cassette is mounted, a signal L is inputted to the IC2 even if the switches (m) and (e) are closed. Moreover, the switch (e) is turned off at the time of pulling out the cassette, the signal H is inputted to an output circuit 4, and the signal H indicating a cassette ejection advance notice is transmitted to a host system after data are held. |
