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861  Bitcoin / Hardware / Re: DIY PCB with AVALON - [Proposed BOM V1] on: April 19, 2013, 09:20:30 AM
Modifying cgminer to use a GPIO port for serial comm should be fairly straight forward. There should a linux serial driver for RasPi already.
The RasPi has USB connections, no need to use GPIO.

https://bitcointalk.org/index.php?topic=161715.msg1883115#msg1883115

For fun... reduce need for usb circuitry.... did i mention for fun?
862  Bitcoin / Hardware / Re: DIY PCB with AVALON - [Proposed BOM V1] on: April 19, 2013, 08:14:31 AM

Are you prepared  to modify the cgminer code to work in that configuration?


yes. or maybe fresh code.
arduino would likely need fresh code from scratch.
the pi would likely need either custom driver for cgminer, or fresh code. im a lot faster in python than c.
863  Bitcoin / Hardware / Re: DIY PCB with AVALON - [Proposed BOM V1] on: April 19, 2013, 08:03:28 AM
Would it be sane to connect the avalon chips to arduino or raspberry pi(not using usb) as host?

Arduino has ports to add "shields", and the pi has gpio headers for simple IO communications....

Question is...

1) Is it doable?
2) Will it be cheaper? assuming the arduino or raspberry pi is free.
3) Is it fun? ( I know answer to this one Wink )

I've never coded embedded systems... but id assume this is pretty simple since all the complex hashing aspects would be inside the ASIC.

I understand that we are all speculating without having specs, and my goal is not to "get rich quick" or something, just have fun.
864  Economy / Scam Accusations / Re: FRAUD ALERT www.liquidnitrogenoverclocking.com and Ed trice on: April 18, 2013, 09:33:04 PM
...but it was the factor google wich has make change mind as he said it was enginered by google i said this is the best thing i can have in the world...

Google is well known for using commodity hardware. They don't use specialized stuff much. Moreover if Google did but stuff from them, even a simple component, there is no way this guy would be telling it to you -- even if the said component was a simple screw and he was really drunk... In fact, especially since this is "designed by Google", this guy wouldn't event know he was selling to Google. It would be routed thru a proxy. AFAIK Google builds their own systems in-house, and are very secretive about their hardware specs and numbers (and locations).

Hope you get your money back... or at-least teach the guy a lesson...
865  Other / Beginners & Help / Re: ASIC (Avalon Mining) on: April 18, 2013, 05:25:02 PM
Thanks for that information...

Can it do anything other than mine currencies or would it be able to be modified to decrypt/encrypt anything using the SHA-256 hash?

FPGA - yes
ASIC - unlikely. sure answer after avalon releases chip specs. I would think these chips are highly optimized for mining only.

@antekh - why is that? Simply because a company won't be manufacturing any ASIC chips for this or because of some other restriction?

because scrypt needs lots of memory for each hash. going to and back from cheap DDR memory takes too long, and the memory closer to the chips are too less in most chips. Its a hard problem to solve since the scrypt algorithm was specifically designed to mitigate attacks from custom hardware.

read this : http://bitcoin.stackexchange.com/questions/1305/what-features-of-scrypt-make-tenebrix-gpu-resistant
866  Other / Beginners & Help / Re: ASIC (Avalon Mining) on: April 18, 2013, 05:08:52 PM
They can do any sha256 based currency.

http://dustcoin.com/mining

any of the "SHA-256" currency listed there can be mined with these chips.
867  Other / Beginners & Help / Why do people use Thai Baht symbol for Bitcoin? Please stop. Thanks on: April 17, 2013, 05:14:57 PM
฿ <-- http://en.wikipedia.org/wiki/Thai_baht
BTC <-- Bitcoin (needs unicode character)

Living in Thailand, its very confusing. I look at a price, and then need to decide that if its bitcoin, or some friendly webmaster has some ip based currency converter to help people calculate.

Even knowing it cannot possibly be Baht, its still confusing.
868  Other / Beginners & Help / Re: [free] CPU mining in the cloud, Quick Hashpower on: April 15, 2013, 02:15:43 PM
I think they closed it. Because I didnt get the 100CZ bonus for the registration.

i think so too. after logging in, balance shows 0 and they didnt launch the server created during signup. They asked to buy credits.
869  Other / Beginners & Help / Re: I left this one Final Bit to understanding Bitcoin Mining Programming, Help on: April 14, 2013, 09:05:56 PM

Looking thru https://github.com/bitcoin/bitcoin/blob/master/contrib/pyminer/pyminer.py#L147

it seems this is what you should send :-

{"method":"getwork","params":["000000029af1f43c342ad525e3c4fd9368a76fbe32a2bfc1d5503b6c0000007600000000e5a720f 8ec330f06fab42bb92f24d5d4211002bb202beb163fbeed28123f8e235166d77c1a022fbe25db7c b100000080000000000000000000000000000000000000000000000000000000000000000000000 0000000000080020000"],"id":1}

#Convert your integer to binary first
nonce_bin = bufreverse(nonce_bin) #reverse it
nonce = nonce_bin.encode('hex') #Get the hex
solution = original_data[:152] + nonce + original_data[160:256] #Mash it with original.

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