Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1983-08-30
1986-06-10
Brigance, Gerald L.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340745, 340748, G09G 100
Patent
active
045945870
ABSTRACT:
Conventional bit-mapped address locations in a character oriented video random access memory (RAM) in which each character is represented by a bit mapping array comprised of ten lines each including eight pixels, or eight bits of information, in an X-Y matrix address organization are redefined in terms of the character and row address locations of a graphics oriented cathode ray tube controller for driving a video display. Groups of bits in the X-Y matrix address locations of the video RAM are shifted in a predetermined manner in generating a redefined, 1:1 mapping function addressing code which is provided to a cathode ray tube controller for driving the video display. A video RAM mapping module is provided for reorganizing the video RAM addresses and translating these addresses throughout the page of the video RAM in providing more efficient graphics mapping while retaining high resolution alphanumeric character video resolution. In one embodiment, a video display start bit is incremented by an 8-bit adder to provide for scrolling on a line-by-line basis without moving character bytes from one location to another in the video RAM.
REFERENCES:
patent: 3577142 (1971-05-01), McMillin
patent: 3624632 (1971-11-01), Ophir
patent: 3967268 (1976-06-01), Roberts
patent: 3970790 (1976-07-01), Guanella
patent: 4417318 (1983-11-01), Hirahata et al.
patent: 4429306 (1984-01-01), Macanley et al.
Chandler Gregg
Rajaram Babu
Brigance Gerald L.
Zenith Electronics Corporation
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