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In Reply to: RE: It did come back on! posted by rickmcinnis@dogwoodfabrics.com on December 31, 2010 at 19:26:15
Interesting what's happening on your mouse. I had to go look how I'd done it... heck, I'd set that up almost 2 years ago! I did mine just as described in the cMP documentation for using the Granite Digital SMPS's to power the USB header... cut the black & red wires, tie-in a 4-pin Molex plug to those wires going to USB recepticles, and plug the power supply, GD or my linear, into that. The black & red wires that go to the plug that fits on the motherboard header are not connected. But now that I type this, I realized that I didn't check if it was tied to ground... I checked, I hadn't done it on purpose, but I did tie the shield on the cable to the ground from the Molex plug and that gets tied to ground through the USB recepticle mounting screws (Hmmmm there's probably some opportunity for better grounding paths there).
To answer your question, yes, the ground on my 5v linear supply for the USB is tied to the motherboard ground. So it wouldn't hurt for you to do this & might fix your USB mouse problem.
Oh, and of course, the likely reason it worked with the spare ATX supply is that it was grounded through the P4 connector.
BTW, a quick experiment to try... plug your spare ATX into the AC without it being plugged into the P4 & the USB header... I'm curious if you'll hear a difference just due to having it plugged into your AC.
On the missing, lamented JackWong & memory power, yes, he was supplying the 1.35v/160ma for the memory from a single, large-capacity (11000 mAh) NiMH battery. He also supplied the 0.65v/120ma for the graphic core this way with a variable resistor to drop the voltage from the battery. I figure the memory supply is worth doing someday (since he said it made the larger impact), but likely pretty far down the road... and I'd like to do it with a linear supply, not a battery to avoid the battery housekeeping issues.
I hope this helps with your mouse issues!
Later!
Greg in Minneapolis
Everything matters!
Follow Ups:
I have not, as yet, tied the supply to the MB's ground, but that has to be the answer.
I will let it be known when I get it to work.
One funny thing though about using the ATX ground for the USB - while this was what I was using my BIOS was very unstable. All would be fine for days and then the default BIOS would return. When one attempted to re-set the BIOS you were given the RED SCREEN saying that I was doing something the BIOS did not like. Usually a simple shorting of the pins would not do the trick. The battery had to be removed for a couple of hours.
Does indicate that grounding (no surprise) is very important for stability. Wish we could get Dave Davenport interested in this but I have tried and he thinks we are all insane to use computers. Well, maybe not insane, he does not think it a good direction. YET, he loves the PS AUDIO Perfect Wave CD system which is very much like one of those dreaded computers!
He is an expert on grounding. Wish he was interested.
You are correct that there is probably much to be gained by some kind of grounding "tricks".
Thanks again for the advice.
Bye,
Rick McInnis
Keep working on Davenport... it'd be great to have his insight.
BTW, are you using his I2S-interface? Very curious how that works for people.
Greg in Mississippi
Everything matters!
That was really driving me crazy.
Of course, it is/was obvious.
Before I was using a separate GRANITE supply for the HDD and I guess that explains why I was never able to get this to work then.
It will be interesting to see if this eliminates the BIOS instability.
Thanks, again,
Welcome... and same to you!
Your BIOS instability does not surprise me. I noticed something similar on stability when I went to the fully-linear supply from the Pico-PSU-based linear-hybrid one... I could run a step or two lower in voltage.
Also on the grounding, when I was tracing out the USB power connection last night, I noticed that the ground pin on the USB cable side of the Molex plug had pulled out (I HATE those connectors... I bet there's a good sonic upgrade available in replacing them!) and was not making contact. I pushed it back in and made sure my wire dressing and component placement (especially HDD) was right... and when I re-booted the system, the sonic 'robustness' through the lower midrange & sense of dynamics & 'bounciness' that had been missing for a couple of weeks and that I assumed was due to Alan Maher CBT's & AC filter chokes breaking in came back. They were (and still are) breaking in... but it was not just that.
I definitely need to setup better ground routing on my 'dirty' connections... I did it very haphazardly back then.
Very glad that the grounding fixed your USB mouse issue.
Later!
Greg in Mississippi
Everything matters!
I have configured my pc to use cMP as per the recommendations on the site. Implied Minlogon as well. But since last evening, none of the USB ports work. If I connect my USB hdd, it gets powered but does not appear in "My Computer", nor does the wireless mouse work. What has gone wrong???
Read, please, more attentively "Step 4 – disable unused USB hubs & controllers" here http://www.cicsmemoryplayer.com/index.php?n=CMP.07Optimisations. Probably you disabled the necessary usb ports.
http://cmp2-mihaylov.narod.ru/
No. All USB ports are enabled. When I connect my USB hard disk it powers up, but it does not get recognised in windows. So does the wireless mouse. They worked fine just a day earlier...
When I connect my USB hard disk, it powers up but it does not get recognised in windows.
If all the USB ports are definitely enabled, you could try re-enabling the Logical Disk Management service (assuming of course you have disabled it) and taking a look at what it reports. If LDM sees the drive but Windows in general doesn't, it's a known Windows bug (that will certainly, definitely be fixed in SP106).
Change the drive letter [Action > All Tasks > Change Drive Letters] and try again. I get this all the time when hooking backup drives in and out of various boxes.
If that doesn't work (and to help retrieve your mouse), go into Device Manager and see if the devices are recognised there. At least until you retrieve the thing, I'd be minded to use a wired mouse.
You should see the drive under Disk drives , the mouse under Mice and other pointing devices and both under Universal Serial Bus controllers .
They worked fine just a day earlier...
That's probably why you didn't post a day earlier . . . :)
BTW, have you checked that the HDD works fine on a different computer?? Especially as it's bus-powered, I'd be minded to check. Bus-powered drives can be moody.
HTH
Dave
Yes the hdd works perfectly fine on my other computers. I will do as u said & post back...
Just connected a USB pendrive to the port ( flash drive). It performs normally, but the USB hdd does not. The USB root hub has reserved only 200ma for each port. Seems too low I guess. Can this be the cause??
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