Information
The following documents are currently available :

The Casio-PC Interface : How can I build the (FX-Interface / FA122) myself ?

The Casio-Casio Interface : How can I build the SB-62 myself ? Communication Protocol Between Casio and PC (CFX9x50 & Graph 25-65) : How can I write a program to communicate with my Casio ? Communication Protocol Between Casio and PC (Algebra Fx 2.0 & Graph 100) : How can I write a program to communicate with my Casio Graph 100 or Algebra FX2.0?

Send( and Receive( commands + protocol : How can Casio programs communicate with the PC in realtime ?