Control of CRT intensity via Apple II software
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An inexpensive, easy-to-build device for the Apple II microprocessor is described. The modification permits software control of four levels of relative screen intensity (contrast) settings for any video monitor. The relationship of the technology to choice reaction time and perception research is briefly indicated. Principles governing operation of the modification are also discussed. Finally, a set of step-by-step instructions for building the device is provided.
KeywordsChoice Reaction Time Video Signal Video Monitor NAND Gate Picture Signal
- 1.Adams-Westcott, J., & Hochhaus, L.Tests of the cascade model of word recognition. Unpublished manuscript, Oklahoma State University, Stillwater, Oklahoma, 1983.Google Scholar
- Sanders, A. F. Stage analysis of reaction processes. In G. E. Stelmach & J. Requin (Eds.),Tutorials in motor behavior. Amsterdam: North-Holland, 1980.Google Scholar