Apparatus and method for scrolling text and graphic data in sele

Details Apparatus and method for scrolling text and graphic data in sele Apparatus and method for scrolling text and graphic data in sele

1981-08-12

1984-03-13

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340703, 340724, 340747, G09G 116

Patent

active

044370938

ABSTRACT:
An apparatus and method for scrolling windows of both graphic and graphic encoded text information on a raster scan display. The apparatus includes a processor which references a program store, and a video refresh buffer, the buffer containing graphic and graphic encoded text data in a pixel format adapted for directly refreshing the display. The processor is operated under control of the program store and responsive to information specifying the pixel locations of opposite corners of a window to be scrolled and the number of rows to be scrolled for calculating the size and location in the display refresh buffer of the window to be scrolled, and for moving the number of rows to be scrolled from source locations to destination locations within the window in the display refresh buffer.

REFERENCES:
patent: 3680077 (1972-07-01), Hoberecht
patent: 3903510 (1975-09-01), Zobel
patent: 4155095 (1979-05-01), Kirschner
patent: 4196430 (1980-04-01), Denko
patent: 4204206 (1980-05-01), Bakula et al.
patent: 4240075 (1980-12-01), Bringol
IBM Technical Disclosure Bulletin, "Local Scrolling with a Multiple Partitioned Display", W. R. Cain, et al, vol. 22, No. 10, Mar. 1980.

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