There is some Casio development support in the casio upstream package.
If you are interested in it, you can take a look into casio*.orig.tar.gz
in Debian source directories.

(note by previous maintainer Milan Zamazal <pdm@fi.muni.cz>)

Debian casio package now comes with more schematics to build the hardware
needed (cable) to connect to a PC, this schematics have been taken from
WWW sites worldwide, and are available at /usr/doc/casio/cable_schem

Javier Fernndez-Sanguino Pea <jfs@computer.org>