Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!psuvax1!rutgers!mit-eddie!media-lab!snorkelwacker!bu.edu!xylogics!transfer!crackers!m2c!umvlsi!dime!dime.cs.umass.edu!chittamu From: chittamu@dino.cs.umass.edu (Satish Chittamuru) Newsgroups: comp.sys.dec Subject: Re: ds3100 gives me a headache Message-ID: Date: 6 Jul 90 14:28:50 GMT References: <6118@helios.ee.lbl.gov> Sender: news@dime.cs.umass.edu Distribution: comp Organization: University of Massachusetts at Amherst Lines: 24 In-reply-to: envbvs@epb2.lbl.gov's message of 5 Jul 90 21:55:15 GMT In article <6118@helios.ee.lbl.gov> envbvs@epb2.lbl.gov (Brian V. Smith) writes: Perhaps you mean fluorescent lights (not neon)? The reason that many (all, in the past) crts use 60Hz refresh rate is to CANCEL the effect of any interference caused by fluorescent lights. If the refresh rate is different than that of the lights, then you get beat frequencies of the difference of the two rolling down your monitor. That is true. If the frequencies are different, then you do get a beat frequency. But even if the frequencies are the same, but are out of phase, then too you would get a flicker. By itself it may not be noticeable, but when you combine it with the fact that a CRT blanks the screen on a vertical retrace, that could be significant. That could be reason for the noticeable flicker. Any comments on that? -- -Satish K. Chittamuru chittamu@cs.umass.edu Software Development Lab. chittamu@umass.bitnet Dept. of Computer & Info. Sciences University of Massachusetts Amherst, MA 01002 === God is real, unless cast to an integer.