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1  Bitcoin / Hardware / How to re-image Beaglebone board for an Antminer S5? on: March 07, 2015, 12:49:43 AM
I have an Antminer S5 which is not working. It does not appear on my list of network devices and so it is inaccessible by HTTP or SSH.

When the Beagleboard and controller board are swapped with known good components from another S5, the miner works as expected. I've contacted Bitmain support and they've advised trying to re-image the Beaglebone board. The problem is I don't know how to do that, and I can't get a clear answer from Bitmain support on how to do it either.

Since I didn't have any spare microSD cards lying around, I bought this one. Bitmain pointed me to these instructions, which only helps with copying the image to the microSD card. I did so with the image provided here using HDDRawCopy.

I put the SD card into the Beaglebone board and booted up the S5. I waited for some time, but nothing ever happened. The fan speed remained low and the unit never appeared on the list of active network devices. I informed Bitmain, and they directed me to this set of instructions, which are not particularly helpful since the stripped-down version of the Beaglebone used for the S5 does not have a USB or 5V power port or a boot button.

The last contact I had from Bitmain was them advising to try with a 4GB microSD card instead. I don't have such a card, and from what I was able to find via search the Beaglebone should support microSD cards up to 32GB so I don't think using a 16GB card is problematic.

I find it hard to believe that no one else has had this issue, though I spent a few minutes searching and couldn't find any useful information. Does anyone know the correct method for re-imaging this board?
2  Economy / Currency exchange / [WTB] Buying BTC with cash deposit @ Bitstamp rate on: July 28, 2014, 01:19:46 AM
I want to buy bitcoins and am offering to pay the Bitstamp rate.

I am Rishodi on LocalBitcoins, a longtime Pro Trader and trusted member with flawless feedback over thousands of transactions with hundreds of trading partners.

$500 minimum, $8000 maximum for trades via cash deposit. I am located in the Eastern Time Zone and if we agree to a trade before 4 pm I will make the deposit the same day. I can deposit to WF, BoA, PNC, SunTrust, BB&T, or Co-op. I also offer other payment methods at varying rates (see my LBC profile).

You will send the BTC first unless you can show that you are more reputable than me. Escrow is welcome but will be at your expense.

PM me if interested.
3  Economy / Computer hardware / [SOLD] Used Sapphire AMD Radeon HD 6870 GPU on: January 21, 2014, 03:16:31 AM
Radeon 6870 graphics card
Amazon product page -- Newegg product page

Comes in original box with manual & (outdated) driver CD. I'll throw in a PCI-e x1 riser, which I had been using with this card, if you want it. Asking 0.15 BTC (or equivalent in LTC) which includes shipping anywhere in the continental US. I have a flawless reputation on localbitcoins. Escrow is fine if you pay the fee.

Default clock: 900 MHz / 1050 MHz
Mines scrypt stably at 322 kh/s when clocked at 950 MHz / 850 MHz at stock voltage.
4  Economy / Service Discussion / OKPay no longer offering services to US customers on: December 04, 2013, 07:23:43 PM
As of today, I logged into my OKPay account and was greeted with the following notice. It states that OKPay will no longer offer financial services to accounts based in the United States, and requests that all US citizens and businesses withdraw their funds from OKPay by the end of the year.

For several months, OKPay has not been accepting new account registrations from the US. I had hoped that they would continue to allow existing accounts based in the US to function. Unfortunately, it looks like another innovative and useful financial service is no longer available to those of us in the US thanks to the overly restrictive and burdersome government regulations we have here.

Edit: So far there has been no official announcement of this policy change on OKPay's news page.
5  Economy / Trading Discussion / Don't use Moneygram to exchange for BTC (as least, not often) on: July 26, 2013, 03:37:42 AM
I am a small seller of BTC on After conducting a dozen or so trades in a few days for which I accepted Moneygram transfer as payment, Moneygram decided to block payments to me without offering any explanation. Last week, I had multiple buyers caught in a bad situation in which they were informed that their payments were placed on hold and they had to call Moneygram in order to receive a refund. Most were able to complete the transactions by sending payment to me through alternative means. One buyer reported that a Moneygram representative informed him that payments to me had been blacklisted due to suspicion of fraud (a completely speculative and baseless accusation). I have contacted them and Moneygram refuses to review the case or their decision. In an e-mailed response, a rep wrote to me that Moneygram offers “person-to-person wire transfer service directed towards fulfilling the customers’ needs of sending money to friends and family members. Person-to-person service cannot be used for any business purposes.” However, this stipulation is not openly advertised on their website and I was not informed at any time prior to being blacklisted from receiving payments. Their customer support reps are generally curt and unhelpful. I strongly recommend not utilizing their services.

I have one buyer who has been trying, unsuccessfully, to receive a refund for nearly a week now. Moneygram will not refund the money to him, and they will not pay it out to me. At this point I'm not sure what to do about this outstanding transaction. The buyer is getting impatient, and I'm sympathetic. I may end up sending him the BTC anyway, although it will cost me personally, in order to maintain my flawless reputation. Now I understand why so few sellers on offer Moneygram as a payment method. It was a mistake for me to do so.
6  Other / CPU/GPU Bitcoin mining hardware / Can't maintain full hardware acceleration mining on a Radeon 6950 on: April 11, 2013, 08:13:16 PM
I haven't actively mined since 2011, but last week I had the good fortune to find a MSI 6950 on Craigslist for $100 and figured it was too good a deal to pass up. If I can earn back the cost of the card before the difficulty skyrockets, awesome; if mining becomes unprofitable for any reason, I'll still have a cheap upgrade to the 5770 currently in my desktop. I have a WHS system that is already running 24/7, so I put the 6950 in there. I installed Catalyst 11.12, which (to my knowledge) is the latest set of drivers with OpenCL that works on WinXP.

The card will only allow me to overclock it as high as 840MHz, and the lowest the memory will downclock to is 715MHz. My server PC is typically headless, but I connected it to a monitor to install the video drivers and make sure that everything was working. I'm using cgminer, but I haven't yet gotten it to run stably for more than a couple hours. The problem I'm having is that it'll crash, and the GPU will reset all of its settings, which includes placing the hardware acceleration setting near the low end of the slider. When this happens, it disables OpenCL, the TightVNC server stops working for some reason (stopping/restarting it has no effect), and RDP is useless as always in this regard. This means that I have to physically reconnect a terminal to the server in order to crank up the hardware acceleration back up to full and get everything working again.

I'm not yet sure why this is happening, so I want to double check some things. My only suspicion is the PCI-e x1 riser I had sitting around which I used to connect the video card to the PCI-e x16 slot in the motherboard, as there wasn't enough space to plug the card directly into the x16 slot. The 6950 has a TDP of 200W, and can get 150W through the two 6-pin PCI-e connectors. Can the remaining power be pulled through a PCI-e x1 connection? I know that the power pins are the same regardless of the bandwidth, but I also recall reading that for some reason PCI-e x1 connections are restricted to pulling 25W through the motherboard. Is that the case here? If so, I guess I should get a x16 riser instead. Thoughts?

Second, because I know this question will be asked, the power supply is a 500W OCZ. Other components in the system are a 95W CPU, the micro-ATX mobo, an optical drive which is almost always idle, 5x HDDss, 2x 80mm fans, and 1x 120mm fan. That's it. There are two 12V rails each capable of providing 18A, so I don't see any reason why the PSU shouldn't be capable of supplying ample power. The more I write about it, the more I think that it has to be a power restriction because of the riser...
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