FRAME BUFFER SYSTEM DESIGNED FOR WINDOWING OPERATIONS Designed for Windowing Operation

摘要

In a frame buffer designed to be coupled to a data bus and an output display in a computer system, the frame buffer is a memory cell of an array for storing data indicating pixels to be displayed on an output display, for selecting a group of adjacent columns of the array. An address decoding device for controlling access to the array, a plurality of devices for selectively writing into each respective column of the group of adjacent columns, a plurality of color value registers, on an output display A latching device for storing pixel data equivalent to a row of pixel data to be displayed, an apparatus for writing pixel data from a selected group of adjacent columns of the array to the latching device, and optionally writing to any respective column of the group of adjacent columns Device, latch or latch A device for connecting a selected one of the other buses is included.