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The keys on the OLPC keyboard are relatively small and the action takes some getting used to — for adults at any rate. However, children who tested our review sample had no complaints (in fact one commented that it was 'addictive, like popping bubble-wrap').
The OLPC XO (left) has the biggest screen, measuring 7.5in. across the diagonal; the Intel Classmate and ASUS Eee both have 7in. TFT screens with native resolutions of 800 by 480 pixels.
The XO's screen is an innovative dual-mode TFT that can operate in greyscale/reflective mode to save power, or in LED-backlit colour/transmissive mode (shown here) for maximum image quality. In greyscale/reflective mode, the resolution is 1,200 by 900 pixels and power consumption is 0.1-0.2W; in colour/transmissive mode, resolution is approximately 800 by 600 pixels and power consumption 0.2-1W, according to OLPC.
The XO has a 0.3 megapixel digital camera to the right of the display; the Classmate has no camera, although there are plans to include one in the next version of the system; the entry-level 'Surf' version of the Eee (pictured here) has no camera, but slightly more expensive models have a 0.3 megapixel unit.
Here is the OLPC XO in e-book (greyscale) mode, with the screen rotated and folded flat, facing outwards. Flanking the screen are the speaker grilles, with the camera (right) and microphone (left) above them. Below the speakers are a quartet of game buttons on the right and a four-way directional pad on the left. Beneath these are the power button (right) and a screen rotation control (left). There are also LEDs for power and battery status on the right, and wireless acquisition and activity on the left.