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From: apratt@atari.UUCP (Allan Pratt)
Newsgroups: comp.sys.atari.st
Subject: Re: Which monitors can use TT high res?
Message-ID: <2939@atari.UUCP>
Date: 13 May 91 19:14:36 GMT
References: <1991May6.015046.13617@netcom.COM> <1991May07.230738.13424@ecst.csuchico.edu> <2933@atari.UUCP> <1991May11.151451.17475@actrix.gen.nz>
Organization: Atari Corp., Sunnyvale CA
Lines: 29

Roger.Sheppard@bbs.actrix.gen.nz writes:
>  I can see the reason for not having a true "mutisynch", if
>the 'TT' has the one same scan rates as the ST's mono one,for all its
>colour modes, but if the 'TT' has support for the ST's 320*200 and 640*200,
>  then I can see the need for a "multisynch" monitor, or should I be
>saying a two synch monitor ?.

Listen carefully:

>> You don't really need multisynch.  All of the color modes use the same
>> timing.

All of the modes on the TT except 1280x960 use the same video timing.
All of the modes on the TT except 1280x960 use the same video timing.

They are different "resolutions" but they all pump video to the monitor
using the same horizontal and vertical timings.  The 200-line modes
actually double the line data, so the monitor sees 400 lines.  Because the
monitor is actually 480 lines high, there are 40-line margins at the top
and bottom.  Thus, the monitor always sees 480 lines.  The width of a pixel
is immeterial to the monitor, as long as it isn't smaller than the
electronics can handle: the 320-dot modes just have wider pixels than the
640-dot modes, but the timing is all the same.

Is this finally clear?

============================================
Opinions expressed above do not necessarily	-- Allan Pratt, Atari Corp.
reflect those of Atari Corp. or anyone else.	  ...ames!atari!apratt