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From: toddpw@tybalt.caltech.edu (Todd P. Whitesel)
Newsgroups: comp.sys.apple
Subject: Re: What to do with the GS
Message-ID: <1990Feb17.112458.1733@spectre.ccsf.caltech.edu>
Date: 17 Feb 90 11:24:58 GMT
References: <900214.16355107.044715@UWEC.CP6> <1990Feb15.152154.22827@ncsuvx.ncsu.edu> <12154@smoke.BRL.MIL> <1990Feb16.134722.12605@ncsuvx.ncsu.edu>
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Organization: California Institute of Technology
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rnf@shumv1.uucp (Rick Fincher) writes:

>In article <12154@smoke.BRL.MIL> gwyn@brl.arpa (Doug Gwyn) writes:

(1)
>>The regular Apple Color monitor sold for use with the IIGS has sufficient
>>phosphor density and beam focus already to support interlacing (I can
>OB>clearly see the dark gaps between the scan lines on mine, and they're
>>almost as wide as the scan line).  I don't know if the Apple Color monitor
>>happens to be able to handle the particular sync that interlacing requires.

(2)
>I disagree here.  If you look at an Amiga in the interlace mode or a IIgs with
>a video overlay card significant jittering of the image occurs because of 
>interlace.

1. Apple's monitor uses an excellent sony tube and your description of the beam
focus and gaps matches that of my DEC VR241 which I have been told handles
interlace wonderfully. (The DEC monitor is really expensive but I grubbed it
from a professor who didn't use it anymore.) So now I want an interlaced video
board to see for myself. If Apple's monitor looks ok with interlace then it
is more desirable: add NTSC in and cheap stereo and you have a nice basic
complement to the //gs.

2. Amiga monitors use _cheap_ picture tubes which look gross with interlace. If
you found the Apple monitor unacceptable then mail me, and I'll find a way to
check it.

Interlacing is mostly horrible for desktop stuff. Phosphor persistance and Beam
focus are the two main determinants of how acceptable interlace will look on a
given monitor, and while it sounds weird I often wonder if people's eyes have
varying persistance when they look at something that is interlaced.

Todd Whitesel
toddpw @ tybalt.caltech.edu