Method and system for placing a bus on hold during the insertion

Details Method and system for placing a bus on hold during the insertion Method and system for placing a bus on hold during the insertion

1993-02-16

1994-05-10

LaRoche, Eugene R.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235492, 369 771, 395425, 395725, G06K 500

Patent

active

053109988

ABSTRACT:
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.

REFERENCES:
patent: 4772783 (1988-09-01), Ono et al.
patent: 4791283 (1988-12-01), Burkhardt
patent: 4794236 (1988-12-01), Kawana et al.
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patent: 4864116 (1989-09-01), Banjo et al.
patent: 4990760 (1991-02-01), Tomari et al.
patent: 5010239 (1991-04-01), Mita
patent: 5088084 (1992-02-01), Komiya et al.

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