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I can think of a couple of different approaches.
1. Get Samsung 940 UX monitors, they get the videosignal over USB. And buy USB over CAT5 extenders, for example Gefen[^].
Pros: You can service really many monitors from one server in the server hall.
Cons: Price of the USB extenders. Might be negotiable if you buy many.
2. Same approach but with VGA extenders and normal monitors.
Cons: Cannot connect as many monitors per Server
Pros: VGA extenders are cheaper, but not cheap.
3. Thin clients
Pros: This might actually be the cheapest solution.
Cons: Not as tamperproof as the thinclient has to be close to the monitor. Administration.
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Isn't usb bandwidth limited to 1024x768x16? That'd require running almost any monitor below native resolution and really sucking the display downward.
Today's lesson is brought to you by the word "niggardly". Remember kids, don't attribute to racism what can be explained by Scandinavian language roots.
-- Robert Royall
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I don't know anything about the compression algorithms used, but there is no apparent speed problems in normal office use.
So for the use similar to flight information displays I can't see how they can be to slow.
Well, I surely wouldn't use a USB monitor for gaming, movies or 3D modeling. 
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Well, the question is: how many displays should the software handle?
If some processing power is requested, or you want to keep the cabling at a low level, you could look into JackPCs, e.g. by ChipPC ((Website)[^]. There even are some version with dual-display support.
Otherwise, you can always go for a Panel PC (one example, though not for your application, is an Apple iMac), which are even available to be built into control panels or other furniture.
If cost is everything, and the displays all will show the same info, go for a display multiplexer. (VGA multiplexer)
Cheers,
Sebastian
--
"If it was two men, the non-driver would have challenged the driver to simply crash through the gates. The macho image thing, you know." - Marc Clifton
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Hi, i am interesting Device programming.
i am already seen C, C++.
i want to learn that technique. so, i was searching book about Device programm and i found below 3 book.
but i don't know these book fit me who is beginner.
1. Programming the Microsoft Windows Driver Model,
2. The Windows 2000 Device Driver Book : A Guide for Programmers 2/E
3. Writing Windows WDM Device Drivers ,
4. Microsoft Windows Internals(4/E)
and if you have other book, can recommend me, please let me know~
have a good day^^~
firstly, i am sorry, i am from korea.
and i am not good in wriitting english so please understand~
Thank you everyone~
modified on Tuesday, July 15, 2008 3:52 AM
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The first book, by Oney, is generally considered the best book. It isnt a beginners bok, none of them are, they all require a very good understanding of C programming (C++ isnt used in the kernel so forget about it).
You might also prefer to use WDF rather than WDM, its easier, but as yet there are no books on it, just the DDK. Well, WDK these days.
Morality is indistinguishable from social proscription
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fat_boy wrote: You might also prefer to use WDF rather than WDM, its easier, but as yet there are no books on it
Actually, there is Developing Drivers with Windows Driver Foundation by Penny Orwick and Guy Smith, published by Micorsoft Press in 2007.
Judy
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JudyL_FL wrote: Actually, there is Developing Drivers with Windows Driver Foundation by Penny Orwick and Guy Smith, published by Micorsoft Press in 2007.
Is it any good?
Morality is indistinguishable from social proscription
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As a reference book, it's pretty good. The driver team at MS always seems to produce much better stuff than the usual MS drek. I've put off buying it for my personal library since I was waiting for the OSR KMDF book to come out. However, that STILL isn't out yet, so I think I'm going to have to bite the bullet and get it. I'm tired of borrowing a friend's copy.
Judy
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so, what book should i see?
firstly, i am sorry, i am from korea.
and i am not good in wriitting english so please understand~
Thank you everyone~
modified on Tuesday, July 15, 2008 7:01 AM
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See my reply to fat_boy for a WDF book. There is no "one" book or a "starter" book for drivers. It's a complex subject and the best way to start is to learn how the OS operates internally.
Judy
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I have "Linux Device drivers" ( Alessandro Rubini published by O'Reilly) but I have not opened it so I am of no help here.
Maybe someone else can comment on this book.
Vaclav
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how can i check whether the audio driver installed or not(in pc) for my vc++ application?
Thnx,
Fedi
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Take a look at setupdi functions. You can enumerate all the audio devices on the system , check their names, their status, and so on.
Morality is indistinguishable from social proscription
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Hi all
I need to create a virtual drive with a fixed drive letter then I want to mount my external hard disk to this location of virtual drive. This drive letter should not change irrespective of reboot or changing the volume name of external hard disk also. I would like to write it in C or C++.
Thanks in advance.
Regards
Rakesh
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Hi all
I am using Celeron 2.0 processor with 512mb ram, when ever i am trying to watch some movie or play some game, my system is getting freez.
i don;t know whats the problem, please help.
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i bet $5 u have a system with on board gfx support that uses shared memory instead of a gfx card.
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Hello all,
I would like to have one PC running a mouse/keyboard simulation program that generates *real* mouse/keyboard input data on the USB port of another PC, effectively controlling the mouse and keyboard on the other PC without having to install any specific driver or application on the destination PC - it should just think it is controlled by a normal mouse / keyboard.
I already searched the web for quite some time on how to write such a simulation program, and either I do not search for the right key words, or it just is not possible (as u might see I do not have any clue of mouse/keyboard signals on the USB port up to now ...).
Does anybody have any clue on how to do this or where to look, or whether it is possible at all?
Many thanks in advance,
Das Ich
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There is one problem: Just like using a VM, you'd have to lock keyboard and mouse usage to one specific computer, which probably isn't what is desired. You are much better off using a "desktop extender" like synergy, which allows you to span your desktop over multiple PCs with multiple operating systems:
http://synergy2.sourceforge.net/[^]
However, you are basically looking for a custom mouse / USB HID driver, which should be possible to implement. Even if it isnt the most sensible way to go.
Cheers,
Sebastian
--
"If it was two men, the non-driver would have challenged the driver to simply crash through the gates. The macho image thing, you know." - Marc Clifton
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Das Ich,
I'm looking into a similar problem right now. A hardware USB injector might help you (ellisys.com offer one, I think, and I've seen some others).
I tried to generate a keystroke inside the machine's driver, to affect a USB device between the machine and a keyboard (that device normally responds to keystrokes). However, it looks like I was stopped by the lower-layer drivers.
Please tell me if you find anything useful.
Regards,
brut.
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So, I've managed to put my UMDF driver together and it actually works like a charm.
Now I'm wondering about the legal issues and the copyright for the source code.
The UMDF Skeleton sample is supposed to be some kind of a boiler plate for writing new UMDF drivers.
I haven't found any advise on how the files are supposed to be treated regarding copyright issues in the documentation/help.
My customer naturally wants to put their copyright notice in all files, but nearly all source files for the driver contains the Microsoft copyright notice.
Someone been there before?
Any ideas?
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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re-write the microsft source files so they are sufficiently different.
Morality is indistinguishable from social proscription
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fat_boy wrote: re-write the microsft source files so they are sufficiently different.
No prior post on CodeProject has made me laugh spontaneously such as this one!
Seriously, I was hoping you would answer my post, but I was also hoping somebody had stumbled on some kind of Microsoft statement that explicitly granted the use of those source files and how the copyright issues should be handled. I mean, the documentation clearly says the Skeleton sample should be used as starting point when developing new drivers and that can be interpreted as we are free to use these files. It is also described step by step how the source of the Skeleton sample should be modified in order to created a new driver.
Any other idea, beside writing to "the author"?
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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a heck of a lot of code is copied off the Microsfdt samples. Why? Because the documentation is so bad for a lot of stuff you have no choice.
So jut copy it, change the code structure a bit, and no court in the world could say it is the same, and therefore protected.
Morality is indistinguishable from social proscription
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fat_boy wrote: a heck of a lot of code is copied off the Microsfdt samples. Why? Because the documentation is so bad for a lot of stuff you have no choice.
Well, can't argue with that.... 
Good point, thanks.
"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown
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