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I was given a machine to work on, but found that the video card (it's a VGA/S-video/DVI card with an AGP connector) was faulty. To get the machine up and running, I simply pulled the original video card out and replaced it with one of my own (it's a VGA card with a PCI connector). That all worked fine. After I got the machine done, I swapped the video cards again, and, no surprise, it did not work. I just wrote it off as a bad video card and told the owner that he simply needed to buy a replacement. He took the old video card with him to ensure an exact match. He tells me later on that the new card does not work. His LCD monitor has both VGA and DVI connectors (as does the video card) so he tried both. I looked at it again, tried both connectors, several cables, all to no avail. Each time, the monitor would simply display, "No data. Check connection." I tried my VGA video card again, and it worked fine. So...
At this point, I don't know if it's the new video card or the AGP slot on the motherboard that is bad, or if I am just doing something completely wrong. Ultimately he could just buy a VGA video card with a PCI connector and be done, but that still does not solve the mystery.
Any ideas?
- DC
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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Check the bios. There might be a manual setting for the video adapter to use as a primary display, and that might have changed to "PCI only" when you removed the AGP card and used a PCI card instead.
Cheers,
Sebastian
--
Contra vim mortem non est medicamen in hortem.
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Thanks. I'll check the BIOS settings this evening.
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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As was mentioned, check the bios, especially if there is an onboard video that was disabled. Often the bios does the interchange between the onboard graphics and the AGP slot activating or deactivating one. Similarly there is sometimes a PCI slot near the AGP that is on a swap interface in bios, either-or, not both.
Strictly on the AGP side, you can set a 4X AGP to 8x only via Bios if you put an updated bios into an older motherboard, resulting in a non-functioning AGP slot due to timing irregularities from the BUS.
When you are not sure of an AGP issue, drop the timing back to 1x or 2x if available and test upward. It is possible a voltage flux on the motherboard as changed the timing on the BUS making 8x AGP unusable even on an 8x board, but 4X AGP might still be available because of the wider timing, or 2X.
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
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Most of this is Greek to me, Jeffry. The owner indicated that the computer used to work, but has sat idle for several months, if not longer, because it had Windows Me on it and was thus very slow and sporadic. Rather than fight with it, he just pushed it aside. He asked me if we could resurrect it by installing Windows 2000 on it. I did and it screams now (although it's a bit hard to see!).
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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DavidCrow wrote: but has sat idle for several months
which is what I expected. Basically my answer was the longer version of check the bios. There are many possibilities with AGP depending on the bios and configuration. Sitting idle long enough to get an interruption in CMOS backup battery (or a "minor" static shock) would result in a default CMOS setting, factory defaults, whatever those are. That would effectively change the settings from working to possibly not working....
Also a stronger static discharge to the VGA port could A) take out a card B) take out an AGP slot.
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
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Jeffry J. Brickley wrote: take out an AGP slot.
an? I wasn't aware of any 2xagp boards in existance. What would the point've been. AFAIK there were no nongfx cards the used the agp bus, and PCIe predated the rebirth of SLI, so there wouldn't've been a need there either.
--
Rules of thumb should not be taken for the whole hand.
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dan neely wrote: an?
it was my poor english way of saying that a static discharge any time during the idle of the computer, could have resulted in killing either the original graphics card, or the slot that the graphics card was sitting. I'm just a country hick who does 3D graphics. 
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
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I checked the BIOS and it indeed had a setting for selecting PCI or AGP. Even though it was already set to AGP (which is odd since the PCI card is the one that works), I tried toggling it back and forth between the two but still could not get the AGP card to work. There was no setting for speed (e.g., 4x, 8x).
Another anomaly I found was that with the machine working using the PCI card, I could simply insert the AGP card into its slot, power on the machine, and it would immediately start beeping.
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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You could also try inserting and removing the OLD (might get damaged) AGP card a few times (with the PC switched off, of course). That might help to remove potential oxidation from the contacts. Also, you could try vacuuming the AGP-slot or cleaning it with compressed air.
As for the BIOS:
Does it work if you select "Load Fail-Safe Defaults" (or, depending on the BIOS, a similar menu entry)? The CMOS might have been lost over the time.
Cheers,
Sebastian
--
Contra vim mortem non est medicamen in hortem.
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Sebastian Schneider wrote:
Does it work if you select "Load Fail-Safe Defaults" (or, depending on the BIOS, a similar menu entry)?
I did load the OEM defaults, but that had no effect.
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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Windows 2000 will not recognize a large number of older VGA cards just like Win2k3 didn't recognize my old Netgear FA310TX (replaced it with a FA-311-TX, and everything is peachy). VGA cards are super cheap nowadays (the one in my Win2k3 server box was only $15). Newegg is your friend.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
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"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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John Simmons / outlaw programmer wrote:
Windows 2000 will not recognize a large number of older VGA cards...
But in this scenario, the older PCI card is working fine. It's the newer AGP card that is not working. Even the older AGP card is not working. On top of that, the machine is rejecting the AGP card long before Windows ever enters the scene.
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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Dead motherboard. Replace it.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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After reloading the OEM defaults, cleaning the AGP slot and trying to start Windows (which should always work, at least in low res), I concur with John.
Replacing the MB seems like the sanest thing to do now.
Cheers,
Sebastian
--
Contra vim mortem non est medicamen in hortem.
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Hi All
How to control a PLC from C# Application
SAS![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
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Please, this is the Hardware forum, for a C# question, post in the C# forum.
Thank you.
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but i am asking about PLC interfacing
SAS
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sajid.salim.khan wrote: but i am asking about PLC interfacing
But using C#. You might get some help here, but I think you would be better off in the C# forum. This forum is more for discussing hardware and hardware problems, not how to use them in programming.
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google
I found 2 tutorials, 4 books, one resume (of a guy who does this), a class at a university, a trade-school. The great and powerful Google knows all, providing you put in the right phrase, partial phrase, or key words.
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
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u should think how plc interfacing with computer, serial/parallel then deal with this aspect using any programming language.
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ı have got a project.I want to circuit diagram and assembly code of controling motor.but i must to use ULN2003a chip on the circuit;
TOPIC=Multiple-Peed Stepper Motor Control and Digital Display
(To be submitted by 5 January 2006)
The term project is about writing an Assembly Language Program to control a Stepper Motor interfaced to a PC through the parallel port. The project contains the following 3 main modules:
1. Stepper Motor Driving Module (Output Module):
· The motor will rotate clockwise if f (forward) key is pressed and will rotate anticlockwise if r (reverse) key is pressed from the keyboard.
· The speed of the motor will be controlled by the external push buttons (Up and Down) connected to the PC through the parallel port. If Up button is pressed the speed will be incremented by 1 out of 10 speeds. Down button will work similarly.
2. Speed Display Module (Output Module):
· The speed of rotating motor will be indicated by displaying a single digit 7-segment display. There will be speeds from 0 to 9. The speed which is displayed on the 7-segment display will also be displayed on the monitor with its direction (clockwise or anticlockwise)
3. Up and Down Push Buttons (Input Module):
· The speed of the motor will be controlled by the two external push buttons. The speed will be incremented or decremented one by one by pushing to Up or Down buttons respectively.
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Are you going to build the circuit? What class are you in? Its a very interesting project but I don't think the people here are going to supply you with a complete schematic and a program written in assembler for no price. There are some programs written in C# that control motors through the parralel port, maybe here or programmersheaven.com
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First, how long have you been sitting on this project, not doing anything?
Now you're down to 3 weeks and haven't got a clue how to do this? You may as well just go on vacation for 3 weeks because you're gonna fail.
Noone is going to just give you a schematic and code to save your butt. You're going to have to do the research yourself to build and test the circuit, as well as writing the code for it. BTW, hardly anyone uses Assembler anymore, especially under Windows, so good luck trying to find an example of that.
Can you tell I hate procrastinators who just think they'll find the complete finished answer to their homework assignment, final paper, or whatever, somewhere out on the Internet, just waiting for them to ask for it and someone to hand it over?
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hi dear
Im not an expert on such stuff but i have done lot of hardware programming using assembly
If i would have to do such a project i will do it like follows:
1. Know All the protocols for parallel port IO
2. Kow the way that chip behaves, i mean the interface exposed by that chip
3. Use some good assembler to code the modules
4. Use a GUI interface to control the modules
Hope this may have given u some idea.
Would u like to send me the chip specification and OS u are goin to use
bye
pitchu
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