Device for protecting selected information in multi-media workst

Details Device for protecting selected information in multi-media workst Device for protecting selected information in multi-media workst

1994-10-13

1998-06-09

Tung, Kee M.

Television

Special applications

Simulator

395501, 39549704, 348739, G09G 536

Patent

active

057649642

ABSTRACT:
The display buffer of a multimedia workstation is partitioned into a display section and a non-display section. The information to be displayed on the display screen is arranged in the display section of the display buffer. An image or shadow of the display section is written in the non-display section (called a lock buffer) of the display buffer. Prior to updating the display section, a controller reads the protection data from the lock buffer and generates control signals which inhibit the writing of data into protected areas of the display section.

REFERENCES:
patent: 4918429 (1990-04-01), Clarke
patent: 4994912 (1991-02-01), Lumelsky et al.
patent: 5220312 (1993-06-01), Lumelsky et al.
patent: 5274753 (1993-12-01), Roskowski et al.
patent: 5392396 (1995-02-01), MacInnis
patent: 5402147 (1995-03-01), Chen et al.
patent: 5477242 (1995-12-01), Thompson et al.
IBM Technical Disclosure Bulletin, vol. 30, No. 12, May 1988 "Modified BIT-BLT in Graphics Display" Beaven et al.

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