04663617 is referenced by 35 patents and cites 6 patents.

By selecting the starting time of the display readout of a pel buffer raster generation, the pel data is mapped to a display screen with an arbitrary displacement with respect to the screen for relocation or scrolling of the pel image on the screen. To compensate for non-congruency between the pel data window and screen viewport definitions and to provide scrolling on a pel basis, the positioning of the window on the screen includes fine adjustment achieved by a determinable delay between the scanning of the buffer and the generation of the screen raster. The display circuits include means to extend the window background to fill in gaps between the edges of a window of pel data chosen to be displayed and a larger screen viewport in which it is to be displayed. System read/write access times to the buffer are interleaved with and synchronized to the data fetch times of the display.

Title
Graphics image relocation for display viewporting and pel scrolling
Application Number
6/582202
Publication Number
4663617
Application Date
February 21, 1984
Publication Date
May 5, 1987
Inventor
Dean A Stockwell
West Hurley
NY, US
Agent
Frederick D Wenderoth Lind & Ponack Poag
Assignee
International Business Machines
NY, US
IPC
G09G 1/00
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