Subject: Re: VGA monitors and the IIGS
From: supertimer@aol.com (Supertimer)
Newsgroups: comp.sys.apple2
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Date: 19 Sep 1999 17:57:44 GMT
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Organization: AOL http://www.aol.com
Message-ID: <19990919135744.01572.00002383@ng-fo1.aol.com>



CUTblakeney@home.com (Jeff Blakeney) wrote:

>The scan doublers for the Amiga should work with a IIgs but I've never
>tested it myself.  They still cost too much for me to play with but
>now that I have an Amiga 500, I might need one because I only have one
>Commodore 1084S monitor and it is being used on my IIgs right now.  :)
>
>I would probably want one of the flicker-free models myself as I have
>a Video Overlay Card in my IIgs and I like to use it to display 320 x
>400 and 640 x 400 interlaced images on my IIgs.

It is important to note that the higher end Amiga units come
with graphics cards that provide VGA/SVGA modes.  This
is similar to plugging in a Second Sight card into the IIGS.
However, that means the Amiga is displaying some modes
at 15kHz and some at 30kHz.  These video cards for the
Amiga do the same as the Second Sight, they map the
15kHz video onto the VGA screen.  This often produces
results that Amiga users consider unacceptable (
especially when running games).

Some scan doublers come with a pass through for the
VGA/SVGA signal and scan double the 15kHz signal.
This produces much better results.  Imagine having one
of these devices on the IIGS!  You could connect the
pass through to the Second Sight card to use its special
modes, BUT when using native IIGS modes, you can
use the scan doubler.  That is PRECISELY what many
of the Amiga scan doublers are for.  To produce better
integration between new and old video.