Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!mtxinu!taniwha!paul
From: paul@taniwha.UUCP (Paul Campbell)
Newsgroups: comp.sys.mac
Subject: Re: multiple mac displays
Message-ID: <355@taniwha.UUCP>
Date: 25 Apr 89 00:21:35 GMT
References: <2680@cadre.dsl.PITTSBURGH.EDU> <10654@polyslo.CalPoly.EDU>
Reply-To: paul@taniwha.UUCP (Paul Campbell)
Organization: Taniwha Systems Design, Oakland
Lines: 33

In article <10654@polyslo.CalPoly.EDU> dorourke@polyslo.CalPoly.EDU (David M. O'Rourke) writes:
>In article <2680@cadre.dsl.PITTSBURGH.EDU> gw@cadre.dsl.PITTSBURGH.EDU (Gerhard Werner) writes:
>>Does anyone have any information on driving multiple duplicate
>>displays (i.e. more than one monitor) from a single MacII,
>>using the standard Mac video card(s).
>
>  I believe all you need to do is put a video card in the MacII and plug
>a monitor into it.  The Monitor CDEV will then allow you to configure
>the two monitors to display them however you want.

I think that he wants to put multiple monitors onto the same video card ...
the problem here is that video cabling is much like SCSI cabling - you need
to make sure that everything is terminated correctly otherwise you get
reflections which are visible as ghosting on the screen. Many monitors
have the terminating resistors built in, this means that you have to
remove the terminating resistors on all the monitors except for the last
one in a string. If you have more than 3 - 4 monitors you may also need a
special video splitter/amplifier (it has to be a special RGB one ...) which
splits things up into a number of strings, the last monitor in each string
should be the only one that is terminated .... finally you should note that
not all 'identical' monitors are the same, usually you will find some 
which have slightly different colors (this doesn't matter with just 1,
you notice it when there is one that's a little bluer than the other 14)
this can be solved by tuning the thing to match the rest or reordering the
monitors so all the 'blue' ones are together so that they are not so noticable.


	Paul

-- 
Paul Campbell
Taniwha Systems Design			UUCP:		..!mtxinu!taniwha!paul 
Oakland CA				AppleLink:	D3213