04542376 is referenced by 98 patents and cites 6 patents.

A system for electronically displaying portions of several different images on a CRT screen comprises: a memory for storing a complete first image as several pixels in one section of the memory and a complete second image as several other pixels in another section of the memory such that the total number of stored pixels is substantially larger than the number of pixels on the screen; a logic circuit for reading a sequence of the pixels at non-contiguous locations in the first and second images and for transferring them, in the sequence in which they are read, to the screen for display with no frame buffer therebetween; the logic circuit for reading including a module for forming non-contiguous addresses for the pixels in the sequence in which they are read with the address of one word of pixels being formed during the time interval that a previously addressed word of pixels is being displayed on the screen.

Title
System for electronically displaying portions of several different images on a CRT screen through respective prioritized viewports
Application Number
6/548430
Publication Number
4542376
Application Date
November 3, 1983
Publication Date
September 17, 1985
Inventor
Ralph O Wickwire
San Diego
CA, US
Ashwin V Shah
Encinitas
CA, US
Roy F Quick Jr
San Diego
CA, US
Leland J Bass
San Diego
CA, US
Agent
Kevin R Peterson
Charles J Fassbender
Assignee
Burroughs Corporation
MI, US
IPC
G09G 1/00
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