| 摘要 |
In a computer system capable of connecting an IC (Integrated Circuit) card, when the IC card is extracted from an IC card holder, a door is opened. A detection signal is output from a detecting circuit to a bus controller by detecting opening of the door. Upon receiving the detection signal, a hold request signal is output from the bus controller to a CPU (Central Processing Unit). In response to the hold request signal, a hold acknowledge signal is output from the CPU to the bus controller after the computer process to be executed is completed. A buffer control signal for disabling a buffer is output from the bus controller by receiving the hold acknowledge signal, thereby interrupting an access signal from the CPU, to hold a bus.
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