Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!sdd.hp.com!think.com!mintaka!bloom-beacon!eru!hagbard!sunic!mcsun!hp4nl!cbmnlux!ecl014!ronald From: ronald@ecl014.UUCP (Ronald van Eijck) Newsgroups: comp.sys.amiga.hardware Subject: Re: Idea: New graphics modes (30hz/25hz like current 60/50) Message-ID: Date: 11 May 91 01:11:01 GMT References: Organization: R&R Software Lines: 31 In article peck@ral.rpi.edu (Joseph Peck) writes: > > I found some time on my hands last week, so I got to thinking about >new video modes for the Amiga. My thoughts ran along these lines: > > Why not take this reduction in frequency a step further, and >offer a 30hz/25hz mode. This would provide a 400/512 non-interlaced >signal and a 800/1024 interlaced signal. Now obviously this wouldn't >work on my 1080, but (demonstrating my lack of video display knowledge) >wouldn't this work on a multisync? > >Comments, attacks and flames welcome, >Joe Peck >peck@ral.rpi.edu I won't flame you, just a reason why it doesn't work. 30/25 hz display have the all famous interlace flickering. This flickering is a lot worse on a 25 hz screen than on a 30hz screen going down the line to 15/12.5 hz will produce pictures that flicker so bad that the upper half of the screen will completely vanish while the videobeam is writing the lower half of the screen. This has everything to do with the speed the eye can see a picture and the time it takes for the fosfor of a monitor to stop gloing. Maybee some more knowledgable person can go into details. -- +-------------------------------------------------------------------------+ | Ronald van Eijck R&R Software | | | | We do the impossible at once for a miracle we need a little more time | +-------------------------------------------------------------------------+