Sorry, typo in the title.
CHDK 1.1.0-2134, Rev 0, Sep 8, 2012.
I'm looking for the shortcut to toggle RAW.
The user guide I have says that on the A series of cameras you use Exposure/Erase to toggle RAW capture mode while in <ALT> mode.
My camera either doesn't have an Exposure/Erase button or I don't know where it is.