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Raster Refresh Compression Data Structure Enhancement

IP.com Disclosure Number: IPCOM000059610D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08

Publishing Venue

IBM

Related People

Authors:
Edgar, AD Parish, SW St Clair, JC [+details]

Abstract

The present method increases the processor's available memory by adding a successive run length instruction to the instruction set of the data compression algorithm for bit map controlled all-points-addressable (APA) displays. The successive run length instruction instructs the raster refresh controller to continue the shifting operation on the previously defined data word, and thus allows a data word to be followed by several instruction words. Using the present method, fewer words are required in the bit map memory. This reduces the memory required for the bit map and reduces the contention between the computer and the raster refresh controller, and thus improves the system performance.