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From: gary@cirl.UUCP (Gary Girzon)
Newsgroups: net.micro.amiga
Subject: Interlaced monitor
Message-ID: <204@cirl.UUCP>
Date: Tue, 10-Sep-85 13:03:33 EDT
Article-I.D.: cirl.204
Posted: Tue Sep 10 13:03:33 1985
Date-Received: Thu, 12-Sep-85 11:38:44 EDT
References: <6789@ucla-cs.ARPA>
Organization: Cochlear Implant Res. Lab, Boston, MA
Lines: 35


> I can't figure out what an interlaced monitor is.
> What will look better in the Amiga: 640x400, or
> 640x200? Does it matter?

	In theory, all monitors should be capable of interlace. During
interlace mode, only half the scan lines are drawn for a particular
sweep. The other scan lines are drawn during the next sweep. In the
AMIGA, 400 line resolution can be achieved this way. The price one pays
is flicker, since screen sweeps are only done 30 times a second, as
opposed to 60 times a second during non-interlace. Thus a higher
persistance monitor is needed to eliminate flicker.

	I would hope that 640 by 400 would look much better. I have
noticed some flicker in the AMIGA interlace graphics demo, where the
spatial resolution gets a bit high. I would like to see text in 400 line
mode - it is too bad that most of the operating system seems to be
locked in 200 line mode right now. It should be possible
to change that since the display resolution is transparent to the
application. 

	One thing that looks quite bad is the color Textcraft display.
It is very hard to look at the screen, which uses black characters with
a white background. The problem is that with a non-interlace display,
the white background is lined with black lines (since the actual
scan lines are not next to each other). The display would look much better
with white on black, or light blue on blue. I have not seen Textcraft
run in interlace mode.

	Has anyone seen the AMIGA with a monochrome display? Since color,
at low resolution (640 by 200 is low resolution for color!) is very hard
to work with, it may be worthwhile investing in a second monochrome
monitor with some sort of scan doubling hardware to get a tighter display.

						Gary