{"by":"joe_bleau","id":880474,"kids":[881414],"parent":880251,"text":"The ARM based HP-20B calculator is fully hackable, and HP has even released schematics and an SDK. Not a lot of non-volatile RAM, though.<p><a href=\"http://www.wiki4hp.com/\" rel=\"nofollow\">http://www.wiki4hp.com/</a>","time":1255483783,"type":"comment"}