Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!gem.mps.ohio-state.edu!tut.cis.ohio-state.edu!bloom-beacon!eru!luth!sunic!mcsun!unido!tub!tmpmbx!netmbx!hase
From: hase@netmbx.UUCP (Hartmut Semken)
Newsgroups: comp.sys.atari.st
Subject: Re: Connecting non-Atari monitors to the ST
Message-ID: <3568@netmbx.UUCP>
Date: 6 Oct 89 21:34:12 GMT
References: <5558@portia.Stanford.EDU>
Reply-To: hase@netmbx.UUCP (Hartmut Semken)
Organization: netmbx Public Access Unix, Berlin, West Germany
Lines: 32

In article <5558@portia.Stanford.EDU> zimm@Portia.Stanford.EDU (Dylan Yolles) writes:
>Is it possible
>to connect a third party hires RGB monitor that could handle all of
>the ST's resolutions? If such a thing is possible, how will the hires
>quality compare to the SM124? What is the price range on such monitors?

Any "Multisync", "Flexscan" or the like can be wired up to the St to
handle all 3 resolutions.
Just follow the pinout of the monitor outlet; R, G and B are self
explanatory, sync can be separetad (Hsync/Vsync) or composite and so on.

The 2 scan modes (35 kHz for high res, 15 kHz for color) are switched by
the mono detect line: ground tells the ST to do high res.


Monitors, that are not able to handle scanning at multiple frequencies,
cannot be used for all 3 graphic modes; they can possibly be damaged!
The scanning frequency is (in older, "pre-multisync" models) used as
time base for the high voltage generator, generating the 10 to 20
kilovolts necessary to accelerate the electron beam. The higher the
frequency, the higher the voltage: a 15 kHz monitor (this is the video
standard!) could be converted to an expensive heap of junk...


hope, this helps

hase
-- 
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
Dennis had stepped up into the top seat whet its founder had died of a
lethal overdose of brick wall, taken while under the influence of a
Ferrari and a bottle of tequila. (Douglas Adams; the long dark teatime...)