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'[OT]How many monitors?'
2000\04\20@065915 by Graham North

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Strange question,

How many monitors can you drive from one graphics card?

I know there will be a limit, but would it be possible to use two or three
with a simple Y cable arrangement?

Thanks

Graham

2000\04\20@092807 by Russell McMahon

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>How many monitors can you drive from one graphics card?
>
>I know there will be a limit, but would it be possible to use two or three
>with a simple Y cable arrangement?


YES, BUT ... :-)

Quality will degrade.
I sometimes run 2 on a Y cable and you get reflections etc and quality goes
down.
Bearable but not nice.
I can run this at 1024 x 768 but you wish you hadn't :-)

You can buy buffers which isolate the input signal and provide a copy at
each output.
You could no doubt build one using the cheap 3 pin monolithic amplifiers
intended for eg cable tv or tv antenna amplifiers but it would be not too
much dearer to buy a ready made unit.

3 monitors on a 3 headed Y would no doubt work but expect substantial
picture quality degradation.



RM

2000\04\20@101828 by Graham North

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Where did you get the connectors from?  I am having a hard time finding any.

Also are monitor cables 1 to 1 or do some wires change pins?

Graham


       >How many monitors can you drive from one graphics card?
       >
       >I know there will be a limit, but would it be possible to use two
or three
       >with a simple Y cable arrangement?


       YES, BUT ... :-)

       Quality will degrade.
       I sometimes run 2 on a Y cable and you get reflections etc and
quality goes
       down.
       Bearable but not nice.
       I can run this at 1024 x 768 but you wish you hadn't :-)

       You can buy buffers which isolate the input signal and provide a
copy at
       each output.
       You could no doubt build one using the cheap 3 pin monolithic
amplifiers
       intended for eg cable tv or tv antenna amplifiers but it would be
not too
       much dearer to buy a ready made unit.

       3 monitors on a 3 headed Y would no doubt work but expect
substantial
       picture quality degradation.



       RM


2000\04\20@105546 by Arthur

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1 in 8 output mulit screen unit listed in a trade only list cost #59 UK
Pounds.
IWish requesters would state where in world thay are. I would respond more
but people living in USA or Far East usualy are able to buy cheaper than
here in the UK.And so is a waste of time.
Art

{Original Message removed}

2000\04\20@115136 by Quitt, Walter

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Win 98 allows for multiple PCI video cards to display
a big desktop on.  Unfortunetly, in my case, the monitors
interfere with each other when they sit next to each other
and then they flicker. :-( That's the only
way I want to use them.  Oh well....

{Original Message removed}

2000\04\20@120843 by Chris Eddy

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I always wanted to do multiple monitors, and the clean solution would be to use
the new flat screen monitors.  That would solve your flicker problem, and I
could place them flat on the wall in front of me, such that my monitor is not
always on a rack to my right hand (say 'neck strain').  Then I would look
really cool.

I just don't want to drop down from one 19" to two 15".

Chris Eddy

"Quitt, Walter" wrote:

> Win 98 allows for multiple PCI video cards to display
> a big desktop on.  Unfortunetly, in my case, the monitors
> interfere with each other when they sit next to each other
> and then they flicker. :-( That's the only
> way I want to use them.  Oh well....
>
> {Original Message removed}

2000\04\20@123556 by Mark Willis

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Mu metal would solve that - but does cost serious $$ per pound (It acts
as a magnetic field blocker.)  You could try sheet steel, first, see if
it improves things;  Don't block the air ventillation, of course.  (A
vertical "wall" between monitors should improve things, I'd hope.)  I'd
bet the flicker's from magnetic coupling between monitors.

Graham:  Those connectors are "DB-15HD" connectors aka High Density
15-pin D-style connectors in the "B" shell;  Look in Mouser or DigiKey,
among others, I'm in the midst of ordering some and am pretty sure that
they're both carrying those in both solder pot and PCB mount versions,
if you bug me I can definitely give you parts numbers and etc., all
that's in the other room right now though.

I'm pretty sure the usual 15-pin to 15-pin cables are straight through,
not so for the NEC etc. 9-pin to 15-pin cables (there are at least 3
differing variants of those!).  The Hardware Book has pinouts,
http://hwb.acc.umu.se/, GOOD resource <G>

 Mark

Quitt, Walter wrote:
> Win 98 allows for multiple PCI video cards to display
> a big desktop on.  Unfortunetly, in my case, the monitors
> interfere with each other when they sit next to each other
> and then they flicker. :-( That's the only
> way I want to use them.  Oh well....
>
> {Original Message removed}

2000\04\20@131816 by Quitt, Walter

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Understand.  In the old DEC days they supported multiple monitors.
With those good Sonys (well shielded) we had no problems.  Dual
or Quad 19 inchers sure was nice.  Two 15s give more area than
a single 19 though.  I can't afford flat 15s so I do with out.
In other times though, I used a single large color monitor and
a Monographics card with a Mono monitor.  I ran a dos window
in that and allowed console output to go to that.  Worked OK
for text output to it.  Might do that again.

Walt...

{Original Message removed}

2000\04\20@150628 by Dwayne Reid

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<x-flowed>At 11:06 AM 4/20/00 -0400, Chris Eddy wrote:
>I always wanted to do multiple monitors, and the clean solution would be
>to use
>the new flat screen monitors.  That would solve your flicker problem, and I
>could place them flat on the wall in front of me, such that my monitor is not
>always on a rack to my right hand (say 'neck strain').  Then I would look
>really cool.
>
>I just don't want to drop down from one 19" to two 15".

Do keep in mind that 15" LCD displays are pretty much equivalent to 17"
glass monitors.  I have at least 4 different brands of 17" CRT monitors
here - they are about 1/2" larger diagonally (viewable area) than the 15"
LCD displays sitting next to them.

dwayne



Dwayne Reid   <spam_OUTdwaynerTakeThisOuTspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax

Celebrating 16 years of Engineering Innovation (1984 - 2000)

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Do NOT send unsolicited commercial email to this email address.
This message neither grants consent to receive unsolicited
commercial email nor is intended to solicit commercial email.

</x-flowed>

2000\04\21@031157 by Graham North

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I am in the UK, could you please tell me where you saw this advertised?

I have looked in Farnell etc and they are too expensive in there (isn't
everything!).

BTW the software being to run and displayed on the multiple monitors is DOS
software, would that make any difference?

Thanks

Graham

       ----------
       From:  Arthur [SMTP:.....artbKILLspamspam@spam@CABLEINET.CO.UK]
       Sent:  20 April 2000 15:51
       To:  PICLISTspamKILLspamMITVMA.MIT.EDU
       Subject:  Re: [OT]How many monitors?

       1 in 8 output mulit screen unit listed in a trade only list cost #59
UK
       Pounds.
       IWish requesters would state where in world thay are. I would
respond more
       but people living in USA or Far East usualy are able to buy cheaper
than
       here in the UK.And so is a waste of time.
       Art

       {Original Message removed}

2000\04\22@035222 by Russell McMahon

picon face
I'm in New Zealand.
SI Computer products sell Y cables.
Dick Smiths might.


Component suppliers will sell connectors which can be used to make your own
cables.

The cables are "straight" - same connections to all plugs/sockets as far as
I know.

1024 x 768 referred to screen resolution.
Standard VGA is 640 x 480 pixels.
1024 x 768 is rather more detailed and more easily made to look bad by poor
cables etc.


     Russell McMahon
_____________________________

>From other worlds - http://www.easttimor.com
                               http://www.sudan.com

What can one man* do?
Help the hungry at no cost to yourself!
at  http://www.thehungersite.com/

(* - or woman, child or internet enabled intelligent entity :-))


{Original Message removed}

2000\04\23@185657 by Russell McMahon

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Try a sheet of ferrous material (galvanised iron or whatever) between
monitors. Will definitely diminish interference and may make it
unnoticeable.
Mumetal works better :-) but costs a zillion dollars a sheet.


     Russell McMahon
_____________________________

>From other worlds - http://www.easttimor.com
                               http://www.sudan.com

What can one man* do?
Help the hungry at no cost to yourself!
at  http://www.thehungersite.com/

(* - or woman, child or internet enabled intelligent entity :-))


{Original Message removed}

2000\04\24@100826 by paulb

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Russell McMahon wrote:

> Try a sheet of ferrous material (galvanised iron or whatever) between
> monitors. Will definitely diminish interference and may make it
> unnoticeable.

 I would have tended to discount this problem, and have here a(n IKEA)
shelving system with two monitors stacked one above the other.

 They weren't causing any trouble to one another as far as I could see
until today when I stacked an older TV set on the shelf above.  The
monitor in the middle is badly affected (horizontally, mainly) by the
TV.

 It's kinda mutual - well, almost.  The lowermost monitor causes
diagonal dots on this TV, even when fed by direct RF from the SNES, but
also the main TV in another room.  I suspect this problem to be one I
have met before - monitors were (they are old ones) dumped in this
country with the mains suppression components (double choke and 2
capacitors) left out at assembly - cheap and nasty.

 Even before I read this post, I had it in mind to go find an iron
plate...
--
 Cheers,
       Paul B.

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