Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!caip!nike!ucbcad!ucbvax!decvax!tektronix!tekcrl!vice!tekfdi!videovax!stever
From: stever@videovax.UUCP (Steven E. Rice)
Newsgroups: net.micro.amiga
Subject: Re: flicker
Message-ID: <1872@videovax.UUCP>
Date: Thu, 31-Jul-86 03:58:52 EDT
Article-I.D.: videovax.1872
Posted: Thu Jul 31 03:58:52 1986
Date-Received: Fri, 1-Aug-86 08:52:03 EDT
References: <829@edison.UUCP>
Reply-To: stever@videovax.UUCP (Steven E. Rice)
Organization: Tektronix, Comm Group, TV R&D
Lines: 37

In article <829@edison.UUCP>, David C. Albrecht (dca@edison.UUCP) writes:

> . . .

> Well, all of this is pretty much water over the bridge.  The
> flicker problem is annoying . . .

> I realise one solution to the problem is a high persistence
> phosphor monitor but as they are quite expensive a circuit
> approach might be just as cost effective and possibly have
> other benefits such as a possibility of reducing the load
> on the processor.  Also, prices on monitors have been
> dropping relatively slowly compared to prices on semi-conductors
> thus a circuit solution can't help but look even better
> as time goes by.
> 
> As I understand it the flicker is caused by the interlaced
> display which updates alternate scan lines at a 1/60 sec rate
> with a total update at a 1/30 sec rate.  With high contrast
> material this causes noticable flicker.  As the memory is
> running flat out during the display period just doing screen
> updates processor cycles have to slip through the cracks.
> Therefore, a 1/60 non-interlaced display rate would require not
> only a faster graphics chip but also faster memory.

It would also require a significantly higher-priced monitor!!
Scanning the CRT at twice the rate of a standard monitor requires
quite a bit more power for the deflection circuits, and beefier
electronics for the drive.  In addition, the bandwidth of the video
amplifier has to double.

All this will come in time (and money. . .).

					Steve Rice

----------------------------------------------------------------------------
{decvax | hplabs | ihnp4 | uw-beaver}!tektronix!videovax!stever