is that its virtual keyboard is stuck in alphabetical (ABC) layout, as opposed to the fx-CP400's option to switch between QWERTY, German QWERTZ and alphabetical layout. Due to this, it is now included in the list of authorised models in American SAT and AP exams. It has a grey-colored appearance, as opposed to the fx-CP400's black on white design. Programming The calculators can be programmed in two ways. The Classpad comes with Casio BASIC, a built-in BASIC-like interpreted language, allowing the user to create programs using built-in functionality. The other method is to create an add-in. Add-ins are binary programs, executing directly on the calculator's CPU. Casio/Saltire has released an SDK, allowing users to create their own add-ins, though no support is provided for this by Casio. The SDK is available for registered users at Casio's website. Currently there is no SDK version compatible with the new Classpad 330 Plus or the fx-CP400. After the release of the SDK, a Lua interpreter plugin (CPlua) was created. This add-in allows users to develop programs and games in Lua. See also TI-Nspire - some models have touchpad and CAS TI-92 series - CAS and qwerty keyboard TI-89 series - CAS HP-49 series - CAS HP Xpander (project was canceled) - It had both a keyboard and a pen-based interface but no CAS HP Prime - touchpad and CAS References External links Casio Resources and Downloads – CASIO WEW Worldwide Education Website. CASIO ClassPad Europa de – Official ClassPad 300 Web site for Casio Europe. Universal Casio Forum – Forum for Casio calculators. Casiopeia – English Casio Calculators Forum ClassPad Yahoo Group – Another related forum. AULA MATEMATICA DIGITAL – website in Spanish. ClassPad Help Series – Tutorial with movies to start learning about ClassPad. CasioEd – Australian resources for learning maths with Classpad. Online Manual Online Manual ClassPad 300 Graphing calculators Products introduced in 2003