Memory saving arrangement for displaying raster test patterns

Details Memory saving arrangement for displaying raster test patterns Memory saving arrangement for displaying raster test patterns

1988-11-02

1990-07-10

Harkcom, Gary V.

Boots, shoes, and leggings

340723, 340798, G06F 1562

Patent

active

049411101

ABSTRACT:
When displaying raster test patterns memory is saved by using comparators which allow a prediction as to which scan line contains valid display information. When a valid scan line is reached, and when the correct horizontal position on said scan line is achieved data is displayed. A Y register holds the value of a valid scan line i.e., one containing picture information and an X register holds the value of the horizontal position of the picture information. Video is provided from a shift register, the output of which is converted to an analog composite video signal. Control logic is provided to load the register.

REFERENCES:
patent: 4435792 (1984-03-01), Bechtolsheim
patent: 4628467 (1986-12-01), Nishi et al.
patent: 4749990 (1988-06-01), Birkner
patent: 4825411 (1989-04-01), Hamano

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