Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!


Forgot your password?

Slashdot videos: Now with more Slashdot!

  • View

  • Discuss

  • Share

We've improved Slashdot's video section; now you can view our video interviews, product close-ups and site visits with all the usual Slashdot options to comment, share, etc. No more walled garden! It's a work in progress -- we hope you'll check it out (Learn more about the recent updates).


Comment: Re:Mostly pointless (Score 2) 51

by ebenupton (#46687209) Attached to: Raspberry Pi Compute Module Release

That's about right. If you're making a small (and by small I mean 50k unit) run it's likely to be worth buying a system on module rather than paying someone to do the fiddly HDI PCB design, finding someone who can assemble PoP reliably and buying your application processor, RAM and Flash out of distribution at high margin.

Comment: Re:BBC News Report has been reinstated (Score 1) 99

by ebenupton (#46082943) Attached to: Bletchley Park's Bitter Dispute Over Its Future

They have edited out a single black and white photograph from the original cut. Compare the first thirty seconds from the two versions:


I wonder who asserted a copyright claim on a grainy seventy year old photograph to get this taken offline?

Comment: Re:CHDK=much better quality for same or slightly m (Score 3, Interesting) 88

by ebenupton (#45625637) Attached to: Create Your Own Bullet Time Camera Rig With Raspberry Pi

If I were building this rig, I would have used the $40 Model A+camera bundle for a cost-per-node of ~$50 including a USB Ethernet adapter and an SD card per node and a decent PSU shared between four nodes.

A bigger issue looking at the videos is the need to equalize the AGC setup (easy) and color temperature correction (harder) across the modules. Perhaps shoot RAW and then fix it with post-processing? This is where the CHDK alternative, with it's better optics and lower sensor variability, really wins out. Plus you'll have Christmas gifts for all your friends and family once you take the rig apart :)

Comment: Re:tl;dr - Still Proprietary Software (Score 3, Insightful) 99

by ebenupton (#45486949) Attached to: Putting the Wolfram Language (and Mathematica) On Every Raspberry Pi

I hope the Foundation folks say "Thank you, much appreciated", and let the kids decide.

That was pretty much what I spent the day saying. Atmosphere among the educators in the room when Conrad announced it this morning was pretty electric. If people don't like the fact that it's only free as in beer, there's always Sage.

Comment: Re:How can the Pi win this award when there are... (Score 2) 91

by ebenupton (#44729461) Attached to: Raspberry Pi, Smart Highways Win World's Biggest Design Prize

Replying on the (probably optimistic) assumption that you're actually interested.

The Raspberry Pi Foundation is a somewhat unusual charity, in that it derives the bulk of its funding from trading activities rather than through "shake the tin" fundraising. In this respect we resemble charities which run high-street retail businesses to supplement their charitable income. Once you reach a certain size, it is considered good practice to separate trading activities into another, generally wholly-owned, business entity, and to have substantially non-overlapping board membership between the charity and the trading entity. I resigned in order to reduce the overlap to a single person, Jack Lang, who chairs the boards of both entities; we subsequently added Louis Glass to the Foundation board, restoring it to the original complement of six people.

More detail in our public filings at Companies House (http://www.companieshouse.gov.uk/).

Comment: Re:How can the Pi win this award when there are... (Score 1) 91

by ebenupton (#44723293) Attached to: Raspberry Pi, Smart Highways Win World's Biggest Design Prize

I resigned as a Foundation trustee in December, though I continue to run the Foundation on a day-to-day basis. I am also managing director of the Foundation's wholly-owned trading subsidiary, Raspberry Pi (Trading) Ltd, which handles the engineering work associated with the Pi.

Comment: Re:How can the Pi win this award when there are... (Score 3, Informative) 91

by ebenupton (#44717691) Attached to: Raspberry Pi, Smart Highways Win World's Biggest Design Prize

A couple of points to bear in mind:

- You can now buy a Model B Pi bundled with a fast 8GB SD card for $40 from both our primary distributors.
- Most other cheap boards use the Cortex A8 core, which is rather a primitive implementation of the ARMv7 ISA. In particular, while it's great at memcpy() and reasonable at integer operations, it has rather poor floating point performance; for a floating-point performance comparison of ARM11+VFP, Cortex A8 and the (more modern and capable) Cortex A9, see:


In other news, the FreshPaper guys are amazing. Definitely the stars of the show here in Copenhagen.

Comment: Re:wayland (Score 1) 259

by ebenupton (#43837617) Attached to: Vastly Improved Raspberry Pi Performance With Wayland

It's not a lie at all - way to play the man rather than the ball.

Most of our users care more about local performance than they do about network transparency, so this is where we're investing our (limited) resources. People who care about network transparency can continue to use X either to or from the Pi; I don't think anyone is seriously suggesting that X is going to be replaced by Wayland in all use cases, merely that Wayland meets a need for high-performance, high-quality, low-power (and lower software complexity) local composition.

The major difference between bonds and bond traders is that the bonds will eventually mature.