G - Physics – 06 – F
Patent
G - Physics
06
F
354/230.85
G06F 9/46 (2006.01) G06F 13/24 (2006.01) G06F 13/26 (2006.01)
Patent
CA 1212478
ABSTRACT Input Signal Handling Apparatus To ensure security of interrupt input signals to a computer system (30-3N) with minimum interruption of the running of programs in the system two interrupt logic units (1) receive interrupt signals on leads (20-2x) from connected apparatus and store flags representing the interrupt signals in an interrupt store (2). Control logic (3) compares each input signal with presentable criteria to determine if such signal is an interrupt signal and, if so, causes the data to be transferred by way of a read register (5) to the connected computer system (30-3N). At the same time the control logic (3) of one of the units (1) designated as the active unit also causes an output on a lead (11) to the other unit (1) designated as the standby unit. If the standby unit determines that an immediate interrupt has occurred and does not receive a signal on the lead (11) 9 its respective control logic (3) will cause the contents of its interrupt store (2) to be transferred to its respective read register (5) and will also cause an additional flag to be entered in the read register (5) indicating the failure of the active unit (1). Designation of the two units (1) as "active" or "standby" is periodically changed by action of the computer system (30-3N).
451839
Fisher Dennis
Lumb Anthony P.
Niblock John A.
Patel Jayant
Fetherstonhaugh & Co.
General Electric Company P.l.c. (the)
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