@Arte Automobilistica
I have attached a current CHDK 1.2 build that doesn't use exmem. Just copy the archive contents to the card, and use the bootable SD card method (it won't work otherwise, ps.fi2 is not included).
My earlier notes about the low amount of free memory still apply.
There are available any more recent version ??
Where i can find recent versions of noexmen CHDK?