Comments on: Model II Warning from 1980 http://www.trs-80.org/model-ii-warning/ TRS-80.org is a source for information about the Radio Shack TRS-80 line of computers, hardware, and software, with articles, interviews, and more! Sat, 21 Jan 2012 03:40:25 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: George Phillips http://www.trs-80.org/model-ii-warning/comment-page-1/#comment-74 George Phillips Wed, 12 Nov 2008 00:26:05 +0000 http://www.trs-80.org/model-ii-warning/#comment-74 I recall similar warnings with regards to Hercules graphics cards on the PC. I think it was something to do with setting the display width or height too small. This made the horizontal or vertical frequency too high leading to some kind of analog burn out in the CRT circuitry. Presumably turning off the video on the Model II leads to invalid CRT controller values. Digging into the Model II schematics might be illuminating. I recall similar warnings with regards to Hercules graphics cards on the PC. I think it was something to do with setting the display width or height too small. This made the horizontal or vertical frequency too high leading to some kind of analog burn out in the CRT circuitry. Presumably turning off the video on the Model II leads to invalid CRT controller values.

Digging into the Model II schematics might be illuminating.

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