Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!apple!motcsd!motsj1!mcdchg!ddsw1!corpane!sparks From: sparks@corpane.UUCP (John Sparks) Newsgroups: comp.sys.amiga Subject: Re: Interlace-Flicker Keywords: Commodore Planning Message-ID: <1390@corpane.UUCP> Date: 2 Feb 90 15:16:39 GMT References: <6721@mentor.cc.purdue.edu> <2016@ultb.isc.rit.edu> <3000@d75.UUCP> Organization: Corpane Industries, Inc., Louisville Ky Lines: 28 liberato@drivax.UUCP (Jimmy Liberato) writes: >robin@sabre.uucp (Robin D. Wilson/1000000) writes: >>No, it is not an impossibility. All you have to do is increase the horizontal >>scan rate from 60hz to 120 and TAH!DAH! you have an interlaced screen that >>flickers not more than a non-interlace screen of the current variety. >Your concept is correct but the numbers are a little off. The stock horizontal >scan rate is 15.75 MHz. Doubling that will give you 31.5 MHz which is >what the IBM VGA standard is. This is the technique (in addition to buffering >the individual interlaced video frames into one) that the flickerFixer uses, >hence the requirement for a VGA or multisync monitor. The "productivity mode" >of the upcoming Enhanced Chip Set will also require a multisync monitor or >Commodore's bisync monitor. Er you are both wrong. The Horizontal Scan rate doesn't have anything to do with interlace, the Vertical refresh rate is what the first guy meant to talk about. Doubling the vertical refresh rate from 60hz to 120hz would fix the problem, but you would have a bunch of new problems, like then the Amiga wouldn't be NTSC compatible, which is the whole Idea behind the inter- lace to begin with. -- John Sparks | D.I.S.K. 24hrs 1200bps. Accessable via Starlink (Louisville KY) sparks@corpane.UUCP <><><><><><><><><><><> D.I.S.K. ph:502/968-5401 thru -5406 Don't take life too seriously. You'll never get out of it alive.