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Hardware evolution
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Hardware Evolution 2008 - 2012
------------------------------

Although the XO has continued to look pretty much the same on the outside, the electronics inside have been changing. For details of the differences, refer to:

- http://wiki.laptop.org/go/Hardware_specification for the XO 1.0

- http://wiki.laptop.org/go/Hardware_specification_1.5

- http://wiki.laptop.org/go/XO-1.75

- http://wiki.laptop.org/go/XO-4

To some extent, the changes were made to keep using high volume parts, and improve performance. The change from 1.5 to 1.75 involved a change of the processor from x86 to arm, and a reduction in power consumption of about 50%. With power management improvements, this permits the XO to last more than 3.5 hours.

XO-4 is available in two models, XO-4 and XO-4 Touch. XO-4 provides multi touch input on the display.

As you can see from the "boot time" comparison, lower power has not been at the expense of decreased performance.

+--------+----------+---------+-----------+
|Version |Hard Disk | Memory  |	Boot Time |
+========+==========+=========+===========+
|XO 1.0  |  1 GB    |256 MB   |	76 s      |
+--------+----------+---------+-----------+
|XO 1.5  |  4 GB    |1000 MB  |	54 s      |
+--------+----------+---------+-----------+
|XO-1.75 |  4 GB    |512 MB   |	47 s      |
+--------+----------+---------+-----------+
|XO-4    |4 or 8 GB |1 or 2 GB|           |
+--------+----------+---------+-----------+

TODO: Add xo-4 Boot Time