On-line verification of video display generator

Details On-line verification of video display generator On-line verification of video display generator

1987-06-19

1988-10-04

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340703, 340747, 371 25, G09G 116

Patent

active

047758570

ABSTRACT:
On-line verification apparatus of a display generation system comprises a memory which has a display portion and an inactive display portion, the display portion storing display information, and the inactive display portion storing test data. Scan logic controls a monitor, the scan logic accessing the memory at a predetermined location corresponding to the position control signals. A generator generates display control information to provide information control signals to the scan beam thereby providing the visual display corresponding to the display information stored in the display portion of the memory. A register stores display control information generated from the test data stored in the inactive display portion of the memory during a retrace period. The display control information stored in the register corresponding to the test data is compared to an expected result, during the retrace period, thereby verifying on-line that the display generation system is functioning correctly.

REFERENCES:
patent: 3524022 (1970-08-01), Schoenthal
patent: 3753032 (1973-08-01), Naidich et al.
patent: 3866171 (1975-02-01), Loshbough
patent: 4464655 (1984-08-01), Bird
patent: 4483002 (1984-11-01), Groom, Jr. et al.

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