Hi Lucy,
This model is very rare now. C-tech is the only one I know of who has the full programming, operation, and initial setup manual for the JCM G-223. You can find it here:
http://the-checkout-tech.com/manuals/cashregisters/JCM_G-223_2in1_owners_programming_and_initial_setup_manual.html
Just copy and paste the link into your browser
Registerman
July 2010