How to check the OS and firmware versions

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1. Type Ctrl-Alt-F1
2. read the build number from the first line of text that appears in the console window, e.g.,

OLPC build 650 (stream ship.2: variant devel_jffs2)

The Ctrl key has a solid diamond on it (♦); the Alt key has an open diamond on it (♢); the F1 key is the same as the Neighborhood key (a black circle with eight white dots on the top row of the keyboard).