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TV_INTERFACE_FOR_TYPEWRITER

2014-11-18 12:49  
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TV_INTERFACE_FOR_TYPEWRITER
Video input circuitfor black and white transistor TV receiver permits feeding video output of TV typewriter to video driver in set, for producing character or DRIVER game display on TV screen. Use of direct coulpling eliminates shading effect or changes in background level as characters are added.Diodes provide 1.2-V offset in positive direction so in absence of video the video driver is biased to blacker-than-black sync level of 1.2 V. With white video input of 2 V, driver is biased to usual 3.2 V of white level. Hot-chassis TV sets can present shock hazard.-D, Lancaster, TV Typewriter Cookbook, Howard W. Sams, Indianapolis, IN, 1976, p 190.