Self-testing computer monitor

Details Self-testing computer monitor Self-testing computer monitor

1983-08-17

1984-08-28

Atkinson, Charles E.

Excavating

364186, 371 3, G06F 1100

Patent

active

044687680

ABSTRACT:
The purpose of this monitor is to detect a failure in either the computer or the monitor itself. The computer supplies an output to the monitor which toggles at a preselected first frequency. The monitor includes a mechanism for sensing if the output of the computer is toggling at a frequency outside a preselected range of frequencies. A test circuit generates periodic test pulses and a clock circuit generates timing pulses. A latching mechanism changes from a first state to a second state in response to the sensing mechanism sensing that the first frequency of the computer is outside said preselected range. A bistable mechanism is coupled to the latching mechanism and generates a second frequency only if the latch mechanism is in its first state and if the test pulses and timing pulses are present at the bistable mechanism. The failure of the monitor to generate the second frequency indicates a failure of the computer or the monitor.

REFERENCES:
patent: 3829842 (1974-08-01), Langdon et al.
patent: 3919533 (1975-11-01), Einolf, Jr. et al.
patent: 4082218 (1978-04-01), Paulinski
patent: 4263647 (1981-04-01), Merrell et al.
patent: 4307463 (1981-12-01), Sibley
patent: 4328583 (1982-05-01), Stodola
A.M. Usas, A Totally Self-Checking Design for the Detection of Errors in Periodic Signals, IEEE Trans. on Computers, vol. C-24, No. 5, pp. 483-489, May 1975.

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