Path: utzoo!mnetor!uunet!cbmvax!hedley
From: hedley@cbmvax.UUCP (Hedley Davis)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Fixing flicker, & future frame rate issues
Message-ID: <3659@cbmvax.UUCP>
Date: 20 Apr 88 14:12:05 GMT
References: <1367@hubcap.UUCP> <3626@cbmvax.UUCP> <8712@agate.BERKELEY.EDU> <3641@cbmvax.UUCP> <8928@agate.BERKELEY.EDU>
Reply-To: hedley@cbmvax.UUCP (Hedley Davis)
Organization: Commodore Technology, West Chester, PA
Lines: 31

In article <8928@agate.BERKELEY.EDU> doug@eris.UUCP (Doug Merritt) writes:
>
>No. "happen to swap" isn't right...I'm claiming that anything that
>animates a full 400 lines of detail at 30hz (which some people certainly
>do!) is already swapping on the correct field, and that *this* is
>what fF breaks.
>
What would happen if someone happened to swap just before odd feilds
were displayed, but the fF swaps display buffers on even feilds ?
( Granted, this may seem odd, but not unlikely ).

>
>>I go further to note that 50 Hz. CRT displays typically flicker.
>
>Yes, and note that they are interlaced, giving a 25hz flicker rate!
>You're thinking as if they are non-interlaced. (The Encyc. Brit. discusses
>these European standard interlaced displays, too.)
>

Not always. In fact, for purposes of this discussion, I was thinking
specifically about non-interlaced 50 hz displays. We build 'em for
europe.  They *are* bright enough to flicker and they *do* flicker.
It is especially bad nowadays because everyone wants their whites
to be 'paper white'. This means bright white, not light grey.

Ask some people who have lived here, and then worked in europe for a
while using 50 hz machines. ( This is unfair, because I have quite
a few such people within a few feet of my desk who all agree that 
50 Hz does flicker. ).

Hedley