Selective page disable for a video display

Details Selective page disable for a video display Selective page disable for a video display

1983-08-30

1986-03-04

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340723, 340798, G09G 128

Patent

active

045742774

ABSTRACT:
A video display system utilizes three banks of memory for producing an 8-color or an 8-level gray scale display. A separate memory plane, or random access memory (RAM) array, for each of the "primary" video colors, i.e., red, green and blue, is used in a bit-mapped video graphics implementation for a computer driven video display. In a monochrome display, pixel mixing produces the 8-level gray scale display. Each of the video planes may be selectively disabled as desired for special applications. For example, a limited animation capability may be provided by displaying one page while generating a new page in a non-displayed page. By disabling the currently displayed plane as the new plane is enabled, instantaneous page modification may be closely simulated for animated applications. The thus disabled video plane may then be used as any normal page of RAM for any other application. In addition, all of the video RAM planes may be disengaged from the central processing unit (CPU) to blank the video display for various applications such as during initial system reset or as part of an operating program.

REFERENCES:
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patent: 4467322 (1984-08-01), Bell et al.
patent: 4481594 (1984-11-01), Staggs et al.
patent: 4484187 (1984-11-01), Brown et al.
patent: 4500875 (1985-02-01), Schmitz

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