Recent content by pcy

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Firewire Ground

Hi Rubycon, Thanks. Makes sense. Sadly it's not available in domestic premises in the UK, and maybe not at all. Peter
- pcy
- Post #24
- Apr 14, 2009
- Forum: Computer Building
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Firewire Ground

Good question. In fact we tried both the F'Wire port on the back IO panel and the front port connected to a header via an internal cable. It made no difference at all. Incidentally, the internal cable is in fact well shielded - each twisted pair has it s own shield, plus a third shield for...
- pcy
- Post #23
- Apr 14, 2009
- Forum: Computer Building
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Firewire Ground

Hi Rubicon, I'm afraid I don't understand: How many systems are we talking obout here. 100s, 1000s. This is a rare problem: you need a big sample to have any confidence that an absense of any issues is statistically significant. What, please is "fully balanced power". I know what...
- pcy
- Post #20
- Apr 13, 2009
- Forum: Computer Building
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Firewire Ground

Hi Modelworks, Thank you. You post moves the discussion forward. Is it possible, though, that the F'Wire cable is in fact picking up RF interferance being put out by the Graphics Card? As it happens I'm in the UK, so I need a 240VAC unit, but now I know the sort of thing to look...
- pcy
- Post #19
- Apr 13, 2009
- Forum: Computer Building
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Firewire Ground

Hi, Yes - I have thought of cutting the ground on either the PC of the FF800. It's a bit of a performance, as the leads are fully moulded - I'd probably use an extension lead with an ordinary plug so I could take it apart and disconnect the earth. I will try that, but I don't expect it...
- pcy
- Post #16
- Apr 13, 2009
- Forum: Computer Building
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Firewire Ground

The F'Wire cable seems pretty well shielded, but I've ordered a ferrit core to see it it helps. Thanks. Peter
- pcy
- Post #14
- Apr 11, 2009
- Forum: Computer Building
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Firewire Ground

Hi, The Motehbaord uses a TI chipset for F'Wire, but I'll give it a shot, thanks. Peter
- pcy
- Post #13
- Apr 11, 2009
- Forum: Computer Building
P
Firewire Ground

Hi Rubycon, Indeed, obvioulsy. That is what I would have thought. But it seems that in fact the ground is always required. Once I had identified the problem, I found a number of people on the net reporting the same finding. Hence my question: What is the ground being used for...
- pcy
- Post #12
- Apr 11, 2009
- Forum: Computer Building
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Firewire Ground

No Indeed I would not expect it to. There may be some statistical relationship between noisy cards in the sense you use it, and silent EMF production that teh F'Wire cable is reacting to, but it is stistical, no necessary. This is a rare problem - you'd need 100s of noisy 8800s all using...
- pcy
- Post #10
- Apr 11, 2009
- Forum: Computer Building
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Firewire Ground

Hi, The interface is a RME Fireface 800. The Motherhboard is an Intel DP35DP The Graphics Card (which is the most likely culprit to be pushing out the EMF in teh first place) is a GigaByte 8600GT. Yes - I have tried several different cables (and cut one up to check it was...
- pcy
- Post #6
- Apr 10, 2009
- Forum: Computer Building
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Firewire Ground

Hi, The noise occurrs whenver any significant change is made to the screen. This is a professional Audio setup. All the analogue cables are already balanced. A 6 pin F'wire cable does indeed supply power, but this is not being used. The system works fine if you cut the (white) power...
- pcy
- Post #4
- Apr 10, 2009
- Forum: Computer Building
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Firewire Ground

Hi, I have a firewire cable that is completing a ground loop, and causing a lot of nasty noise. The Firewire cable is connecting a PC to an external sound card with its own power supply and its own connection to the mains, so I tried cutting the ground in the cable. But it seems theat...
- pcy
- Thread
- Apr 10, 2009
- Replies: 25
- Forum: Computer Building
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17ms Screen refresh rate tech question

Hi, I'm unsure what you mean by a "timed image" in this context, but I suspect it does not matter. AFAIK the screen collects a complete image and writes the whole of it to the display matrix and leaves it ther for teh refresh period while it organizes the next image. Peter
- pcy
- Post #2
- Mar 12, 2009
- Forum: Ask a Technical Professional
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The Future of Kernels, Operating Systems, and "Tech"

Hi, The answer to that is simple. As well as the increased development costs, the result would be unsable and slow. If Word and Photoshop both had their own HD driver (for example) there is no way they would co-operatre properly. They would lock eachother out, steal eachother's IRQs and...
- pcy
- Post #20
- Feb 26, 2009
- Forum: Ask a Technical Professional
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The Future of Kernels, Operating Systems, and "Tech"

Hi, To answer the original question: The basic structure will never change. The reason for this is that the basic structure is not driven by technology, but by the fundmantal nature of a computer as a tool used by humans. What we have is: Hardware OS: Device Drivers, Event...
- pcy
- Post #14
- Feb 22, 2009
- Forum: Ask a Technical Professional

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