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/usr/share/X11/xkb/keycodes/olpc is in xkb-data 2.16-1ubuntu1.

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The actual contents of the file can be viewed below.

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// OLPC's mechanical keyboard moves several keys to the AA row.  make
// them easier to write symbol files naturally.

// see http://wiki.laptop.org/go/OLPC_English_Non-membrane_Keyboard
// and http://wiki.laptop.org/go/OLPC_Spanish_Non-membrane_Keyboard

default
xkb_keycodes "olpc" {

   alias <AE00> = <TLDE>;	// many OLPC keyboards don't put tilde there
   alias <AC12> = <BKSL>;	// on model olpc, physical position of BKSL

};

default
xkb_keycodes "olpcm" {

   alias <AE00> = <TLDE>;	// many OLPC keyboards don't put tilde there
   alias <AA02> = <BKSL>;	// on model olpcm, new physical position of BKSL
   alias <AA06> = <AE12>;	// on model olpcm, new physical position of =+
   alias <AA07> = <AC11>;	// on model olpcm, new physical position of '"

};