If you have arrived at this page you’ve probably run into the same problems that I did with mame4all for GPH Caanoo.
Mame4all needs version .37b5 roms in order to work successfully, without these you will find that very few mame roms run properly on the Caanoo if at all.
The correct set of roms have been kindly generated by the french caanoo community and can be found at the link below
http://www.mediafire.com/?udi19tx3b96no
Happy gaming