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Showing posts from 2007

OLPC review now online, English too

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.

Croquet SDK 1.0 released

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

In-depth review of XO in German c't magazine

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 .

Croquet for Business: Qwaq Forums

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

Interactive OLPC XO Display Simulation

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

OpenGL in a Workspace

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

Stripped XO

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 The colors are off for some reason after uploading to blogger - they were fine on my disk. Sorry.

Etoys kid-tested on XO

I brought my green machine home this weekend, and my twins had fun with it. Enormous fun in fact for the two 7-year olds, pounding on TamTam furiously. I couldn't bear it anymore after half an hour or so. Instead, I showed Jakob how to make a little figure bounce around on the screen in Etoys, while his sister went to practice her cello. He painted a simple head, and then we used the "forward by" and "bounce" tiles in a tiny two-line script making it move around. I made the mistake of pointing out that the "bounce" tile can produce some noise when bouncing. Endless fun trying the different noises ensued. Oh well. Disturbed in her practice by these noises, Sophie came over and wanted to paint, too. So we saved Jakob's project and started a new one for her. I sat back to work on my email and let her brother teach. She spend like half an hour just painting the figure. The paint tool showed that it is not tuned to the XO's display resolution yet, i

OLPC talk at design school

I gave a talk about the $100-laptop at the Magdeburg school of Industrial Design . We did some very inspiring projects using Squeak, Etoys, and Croquet together before. The designers always come up with interesting ideas, even though not everything is directly implementable by us developers. Carola Zwick, dean of the school, wrote a book Designing for Small Screens that certainly gives valuable insight for OLPC developers, and she provided (though indirectly) some very important infrastructure for the OLPC office: her group designed the chairs they are sitting on. I got the actual invitation by Christine Strothotte, who got her PhD doing computer graphics in Smalltalk just a few years before I got mine from the same school. She's teaching interaction design nowadays. I'm looking forward to doing an OLPC-related project with these great folks. A student took some photographs during the talk. Also, from his blog post it seems I convinced him of the merits of the OLPC project

Sophie, Tweak on the OLPC laptop

I just installed Sophie on my green machine. Sophie is a project of the Institute for the Future of the Book , is implemented in Squeak (just like my Etoys activity on the laptop) using Tweak as its UI framework (which is the original topic of my blog). Tweak is also the base for the next-gen Etoys. Installation went pretty smooth. I downloaded the cross-platform zip file using the Web activity from Sugar and unpacked it using the command line. The first start of Sophie failed, but after replacing the failing plugin with one from the pre-installed Squeak it started and worked. Yay! This is an excellent example why it's a good idea to have a regular X11 installation on the kid's laptop: a lot of software will just work, even if it is not correctly integrated into the Sugar UI. Michael Rüger of impara (a Squeak shop leading Sophie development here in Magdeburg, Germany) came over and made a little book, downloading two logos directly from the web (Sophie can do that!), addi