02 October 2010

Low Cost 100 Dollar Educational Laptop

Low Cost 100 Dollar Educational Laptop :
The mission of this non-profit association (One Laptop Per Child) is to develop a low-cost laptop - the "$100 Laptop" - a technology that could revolutionize how we educate the world's children. Their goal is to provide children around the world with new opportunities to explore, experiment, and express themselves.

A small machine with a big mission. The XO-1, previously known as the $100 Laptop, Children's Machine, and 2B1, also nicknamed ceibalita in Uruguay, is an inexpensive subnotebook computer. The XO is a potent learning tool designed and built especially for children in developing countries, living in some of the most remote environments. It’s about the size of a small textbook. It has built-in wireless and a unique screen that is readable under direct sunlight for children who go to school outdoors. It’s extremely durable, brilliantly functional, energy-efficient, and fun.

The latest version of the XO-1 is XO 1.5. The specs for XO motherboard are as follows:

* CPU: 433 MHz AMD Geode LX-700 at 0.8 watts, with integrated graphics controller

* 1200×900 7.5 inch (19 cm) diagonal LCD (200 dpi) that uses 0.1 to 1.0 W depending on mode. The two modes are:
o Reflective (backlight off) monochrome mode for low-power use in sunlight. This mode provides very sharp images for high-quality text.
o Backlit color mode, with an alternance of red,green and blue pixels.

* 256 MB of Dual (DDR266) 133 MHz DRAM (in 2006 the specification called for 128 MB of RAM)

* 1024 kB (1 MB) flash ROM with open-source Open Firmware

* 1024 MB of SLC NAND flash memory (in 2006 the specifications called for 512 MB of flash memory)

* Internal SD card slot

* Wireless networking using an “Extended Range” 802.11b/g and 802.11s (mesh) Marvell 8388 wireless chip, chosen due to its ability to autonomously forward packets in the mesh even if the CPU is powered off. When connected in a mesh, it is run at a low bitrate (2 Mbit/s) to minimize power consumption. Despite the wireless chip's minimalism, it supports WPA. An ARM processor is included.

* Dual adjustable antennas for diversity reception.

* Water-resistant membrane keyboard, customized to the locale in which it will be distributed. The multiplication and division symbols are included. The keyboard is designed for the small hands of children.

* Five-key cursor-control pad; four directional keys plus Enter

* Four "Game Buttons" (functionally PgUp, PgDn, Home, and End)

* Touchpad for mouse control and handwriting input

* Built-in color camera, to the right of the display, VGA resolution (640×480)

* Built-in stereo speakers

* Built-in microphone

* Audio based on the AC'97 codec, with jacks for external stereo speakers and microphones, Line-out, and Mic-in

* 3 external USB 2.0 ports.

* Power sources:
o DC input, ±11–18 V, maximum 15 W power draw
o 5-cell rechargeable NiMH battery pack, 3000 mAh minimum 3050 mAh typical 80% usable, charge at 0…45°C
o 2-cell rechargeable LiFePO4 battery pack, 2800 mAh minimum 2900 mAh typical 100% usable, charge at 0…60°C
o 4-cell rechargeable LiFePO4 battery pack, 3100 mAh minimum 3150 mAh typical 100% usable, charge at -10…50°C
o External manual power options include a pull-string generator designed by Potenco, and a clamp-on crank generator similar to the original built-in one.
o External power options include 110–240 Volt AC as well as input from an external solar panel.

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