Dr. Vanessa Freudenberg

The extensive OLPC article by c't magazine is now available online in both original German and an English translation . It's a thorough review (they had a B1 machine) with some interesting photographs in it, like the Squeak Etoys screen in reflective and backlight modes with microscopic images revealing the working of the XO's incredible LCD.

Get it while it's hot from the equally new Croquet Consortium web site.

There's a glowing review of the OLPC project and its XO machine in the current issue 07/2007 of c't magazine . The in-depth article by Dr. Jürgen Rink describes the project's history and educational ambitions as well as its current prototype hardware and software. One very interesting detail is a comparison of the XO's novel dual-mode display in low light and bright sun light, at normal size and magnified: On the left, under indoor lighting, the colored backlight shines through holes in the reflective layer. On the right, when brightly lit outdoors, the reflection is so strong that the backlight is not even visible anymore, thus creating a gray-scale image. The photographs show one of the example Etoys projects. The magazine is available now at kiosks until next week, or via mail order . In a few weeks the article should be available online via click&buy .

So Qwaq came out of "stealth-mode" and reveiled what they have been working on for a while now, Qwaq Forums : Qwaq Forums, the company's first product, is a secure virtual workspace application that significantly increases the productivity of distributed teams by bringing critical resources together in virtual places, as if they were in an actual physical location. A highly interactive and persistent environment, Qwaq Forums enables users to work, collaborate with others, and identify and solve problems. And I'm proud to say I contributed a little, which most probably will find its way into the next Croquet release. Update: Here's a few nice stories of fellow bloggers who have seen Forums already. From Steve Borsch's Connecting The Dots : Qwaq will get traction only because they completely understand that giving someone a semi-trailer truck (i.e., an engine like There or Second Life) doesn't do much good if the person has a small garage and needs a vehi...

Many people still have not seen the innovative display of the OLPC project's "XO" laptop. It has twice the resolution of a regular LCD (200 dpi), and works in bright daylight in gray-scale reflective mode. It's impossible for me to increase your screen's resolution by software, and I cannot make your display reflective, but here is an interactive simulation of the backlight mode with its interesting color pattern. This pattern is the source of a lot of confusion about the "color resolution" of the display. The LCD has 1200x900 square pixels, but the backlight puts a full color through each pixel. It is not made of red, green, and blue sub-pixels like a regular LCD, but the first pixel is full red, the second green, the third blue, and so on. The DCON chip (Display CONtroller) selects the color components from the full-color frame buffer. My simulation of the DCON achieves the same effect by selecting either the red, green, or blue color component in each...

On some modern Linux systems, Croquet does not work anymore because OpenGL failes to initialize. Now, I originally wrote that code, and it worked fine for years. So it can't possibly be buggy, right? Jens Lincke of impara tracked it down to the "Composite" extension that is enabled by default nowadays. With Composite disabled, it works, enable it, and it does not. So I turned to NVIDIA for help, thinking their driver might be buggy. Had to give them an easy way to reproduce the problem, this is the snippet I came up with: | ogl green | ogl := OpenGL newIn: (0@0 extent: 100@100). green := 1. [[ ogl glClearColor(0, green, 0, 1). ogl glClear(16r4000). ogl swapBuffers. Sensor waitClickButton. green := 1 - green. ] repeat] ensure: [ogl destroy] Beauty, eh? ;-) I guess nobody has done this in a workspace for a long time. Stop it with Alt-. Anyway, NVIDIA could reproduce the problem, and found our bug: [...] the app is trying to create a ...

Early in January, my laptop was the star of a photo shooting for the German issue of MIT's Technology Review . We took off the plastic enclosure of the "brick", it was pretty interesting, for example to see how the whole display in its metallic housing is carefully held by rubber mounts. This photograph was published in the magazin's current issue (02/07), along with a shot of the main board (which sits behind the display). The accompanying text not only provided a description of the parts, but also highlighted some design decisions that makes it unique hardware-wise. OLPC's educational goals were already reported on in the previous issue. Image courtesy of http://www.heise.de/tr/magazin/ The colors are off for some reason after uploading to blogger - they were fine on my disk. Sorry.