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In page Framebuffer:

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Computer researchers had long discussed the theoretical advantages of a framebuffer but were unable to produce a machine with sufficient memory at an economically practicable cost.[citation needed][1] In 1947, the Manchester Baby computer used a Williams tube, later the Williams-Kilburn tube, to store 1024 bits on a cathode-ray tube (CRT) memory and displayed on a second CRT.[2][3] Other research labs were exploring these techniques with MIT Lincoln Laboratory achieving a 4096 display in 1950.[1]