Diagnostic display using front panel LEDS

Details Diagnostic display using front panel LEDS Diagnostic display using front panel LEDS

1995-01-17

1997-07-08

Karlsen, Ernest F.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Instruments and devices for fault testing

324133, G01R 3102

Patent

active

056465351

ABSTRACT:
A computer system has dual-color LEDs for the LEDs conventionally indicating power on and hard disk drive activity, and a control circuit drives the LEDs in on-off and color combinations to indicate diagnostic information. In a preferred embodiment, a control circuit for controlling the LEDs is addressable as a port, and state combinations of the LEDs are set according to data sent to the port address of the control circuit. Also in a preferred embodiment, a POST routine for the computer system is divided into specific tests and groups of tests by commands configured to write a specific data string to a port address depending upon the position of the control command in the POST routine.

REFERENCES:
patent: 3838339 (1974-09-01), Brandt
patent: 4439156 (1984-04-01), Marshall et al.
patent: 4550287 (1985-10-01), Babcock
patent: 4825150 (1989-04-01), Sirasud
patent: 4837565 (1989-06-01), White
patent: 5066929 (1991-11-01), Frantz

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