Phoronix: Linux Kernel Port To TI-Nspire Graphing Calculators
The Linux kernel has been ported to the Texas Instruments TI-Nspire. The TI-Nspire series platform powers higher-end graphing calculators in recent years from the Dallas-based company...
I used TI calculators loads in school (easy to learn to program and lots of useful statistics and graphing stuff integrated).
More to the point though, why would anyone want to put Linux on one and program it in another language? There's plenty of far better hardware available.
I guess a Android smartphone with some calculator app would be a much better calculator.