Boots – shoes – and leggings
Patent
1989-08-10
1992-09-29
Lee, Thomas C.
Boots, shoes, and leggings
3649272, 3649274, 364933, 36492692, 3649391, 364DIG2, 340750, 340799, G06F 700
Patent
active
051519976
ABSTRACT:
A computer which provides a video signal for display is disclosed. The computer has a central processing unit (CPU) which executes a program to provide video data for a display which is organized as a matrix of pixel elements, each pixel element being represented by a certain number of bits of video data stored within a random-access memory (RAM) in the computer. A video integrated circuit is coupled to the RAM to provide N bits of video data per pixel to the display at a dot clock rate consistent with the requirements of the display. This video circuit, rather than having its own video RAM, shares the system memory (i.e., RAM) with the CPU. A memory controller arbitrates access to the RAM between the CPU and the video circuit in a manner that denies access to the RAM by the CPU whenever the video circuit is reading video data from the RAM.
All of the video circuitry is incorporated on a single printed circuit board with the rest of the computer circuitry, thereby obviating the need for a separate video card with its own expensive video RAM, and permitting access to the video data at a substantially faster rate than that of past systems.
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Examiner's Search Report; M. J. Davis; U.K. Patent Office; Application No. 9016822.0; May 21, 1991.
Bailey Robert L.
Howard Brian D.
Apple Computer Inc.
Lee Thomas C.
Treat William M.
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