Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!cbmvax!daveh
From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Still more A3000 questions...
Keywords: A3000, video
Message-ID: <11258@cbmvax.commodore.com>
Date: 2 May 90 19:50:20 GMT
References: <1990May1.213054.16935@ux1.cso.uiuc.edu>
Reply-To: daveh@cbmvax (Dave Haynie)
Distribution: usa
Organization: Commodore, West Chester, PA
Lines: 45

In article <1990May1.213054.16935@ux1.cso.uiuc.edu> menelli@cs.uiuc.edu (Ron Menelli) writes:

>1). I have a pretty good idea about what kind of output the de-interlacer
>    gives for each graphics mode, but I'm a little unclear on the PAL
>    resolutions. Any A3000 can do PAL mode, right? I believe I've seen
>    software that switches between the modes (PALBoot ?), so I'm assuming
>    that is how you can get to these modes. 

Same basic mechanism, though of course supported in 2.0 via a preferences editor.
An NTSC machine in PAL mode will be 1% off, as will a PAL machine in NTSC mode.
Only an issue if you're genlocking.

>    The real question is, is the de-interlacer output for PAL mode still at 
>    31.5 KHz, or is it something else? 

It is still at 31.5KHz

>    And if it is 31.5 KHz, how does it handle the extra vertical resolution? By using 
>    overscan?

The same way PAL uses the basically same horizontal frequency as NTSC and still gets
the extra lines -- by increasing the vertical display time.  So NTSC gives you 60Hz
vertical refresh, PAL gives you 50Hz.  

>2). I plan on getting a NEC MultiSync 3D monitor (regardless of whether the
>    PAL resolutions require it) for future compatibility reasons (can you
>    say ULowell?) 

We've used a number of NECs here, and never had a problem to my knowledge.  I
think they're among the best.

>    interlace not supported (for 1280x400 and 640x960 modes)

I'm not sure if anyone's tried those modes with the NECs.  I'm still using a Moniterm,
or I probably would have tried those out myself.  

>Thanks in advance for any help,
>Ron "I want my A3000 NOW!!!" Menelli
>menelli@cs.uiuc.edu


-- 
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