Of HP fame is a bit missleading. HP calculators are programmed with the RPL Programming language,[1] that was both a high level user language and a low level system language for the 4-bit Saturn processor.
This is a free and portable reimplementation, with a few extensions (and some incompatibilities).
There also is a unrelated iPhone RPL reimplementation [2].
IMO the most comfortable way to program a calculator, i personally use a HP-28c with 680 KHz 4 bit cpu. I think it's crazy how much you can do with so little power.
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There also is a unrelated iPhone RPL reimplementation [2].
IMO the most comfortable way to program a calculator, i personally use a HP-28c with 680 KHz 4 bit cpu. I think it's crazy how much you can do with so little power.
[1] http://en.wikipedia.org/wiki/RPL_(programming_language)
[2] http://naivedesign.com/ND0/ND0.html