Looks interesting... It\'s a Linux handheld that emulates an HP49 or TI89, or runs in \"native\" Linux mode. Described as a \"Scientific PDA\". It was designed by 2 of the architects of the HP49.
There are HP49 and TI89 emulator for Linux. If you have one of those scientific calculator then you will be able to extract the ROM and build and run the emulator for pdaXrom. If you find HP49/TI89 emulator for QT, then the Qtopia port will be easier.
I never tested the HP49 but had HP 48G/48GX/SX. The TI89 is a great tools. Mine works for years. Playing Street Fighter 2 on the TI was great.