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From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga
Subject: Re: A1950
Message-ID: <11326@cbmvax.commodore.com>
Date: 4 May 90 13:59:45 GMT
References: <1625@mindlink.UUCP> <1289@nisca.ircc.ohio-state.edu> <3244@rorschach.oakhill.UUCP>
Reply-To: daveh@cbmvax (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 38

In article <3244@rorschach.oakhill.UUCP> eric@rorschach.UUCP (Eric Quintana) writes:
>>>  Can you supply any quantitative info [ about the 1950 monitor ] ?

>I'm confused.  How does 1280 x 400 work on a monitor that only has 800 dots
>horizontal resolution?  Is the screen cropped?

Most monitors are horizontally analog, in that there are an infinite number of
possible dot positions across the screen.  For example, video compatible monitors
like the 1080.

That's not to say that the average monitor is fast enough to resolve the associated 
pixel changes if you're trying to read text at that resolution, though the 1080s
I've seen this on do a fair job.  

You've seen this effect before, though you may not notice it.  If you've ever 
compared Amiga video titling to the kind you see on "Wide World of Sports" or
other TV shows, the Amiga occasionally comes up lacking.  That's because it is
spitting out 720 or do dots/line (assuming overscan).  Really good titling
boxes spit out about 1400 dot/line, and I've heard some are even going to 2000
something.  You know you can't even read 640 dot computer text on a TV, but 
what you can see on a TV is accurate but widely spaced high resolution pixel
changes.  What this means in plain terms is, in 1400 dots/line mode (again
assuming interlace), Amiga titles will look much less jaggy than they do in
720 dots/line mode.  

I guess the main point of the ECS Denise was to give you a cheap 640x480 
31kHz non-interlaced display that could drop into any A500/A2000.  The 
640x960 31kHz interlaced and the 1200xN 15kHz modes were sort of side
effects.  At least the latter have some real uses on the Amiga, but they're
not the CAD-type uses folks think of when you mention "1200xN".

>Eric Quintana


-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
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	"I have been given the freedom to do as I see fit" -REM