Write-protect apparatus for bit mapped memory

Details Write-protect apparatus for bit mapped memory Write-protect apparatus for bit mapped memory

1984-11-27

1988-08-16

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340721, 340747, G09G 100

Patent

active

047647647

ABSTRACT:
A pattern write protect system approximates a memory area for data entry with a multiplicity of rectangles and determines when a point for entry is within the window by establishing a relative position of the address point coordinates to the coordinates of the sides of the rectangles. A less than/greater than signal for each address coordinate relative to the sides of each rectangle is derived. These signals are summed and the resulting sum signals are then multiplied to provide an enable gate signal.

REFERENCES:
patent: 3497760 (1970-02-01), Kiesling
patent: 3639736 (1972-02-01), Sutherland
patent: 3889107 (1975-06-01), Sutherland
patent: 3996673 (1976-12-01), Vorst et al.
patent: 4492956 (1985-01-01), Collmeyer et al.
patent: 4663618 (1987-05-01), Hayles et al.

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