HP 35s Tear Down at embedded.com (updated)
Editor in Chief Richard Ness breaks open the calculator, and finds two ICs and twenty-five screws. Mr. Ness also discusses the design with Sam Kim, director of product development for HP calculators. Mr. Kim notes
Unlike one of the predecessor models (the 41), there's no way for the user to tap in to the 35s' firmware. The programming only occurs at the user level, although HP is tinkering with giving users limited access to the firmware.
Kim offers, "The 35s is pretty much hacker-proof, but the old 41 had a lot of hacking going on because it was more of an open platform. There was something called synthetic programming, and there was a crowd that evolved around it. I was actually a member of that crowd, the diehard HP users."
Update: Mr. Nass also made a short video discussing the teardown, available at the EE Times trade journal site.
HP 35s at HP
Unlike one of the predecessor models (the 41), there's no way for the user to tap in to the 35s' firmware. The programming only occurs at the user level, although HP is tinkering with giving users limited access to the firmware.
Kim offers, "The 35s is pretty much hacker-proof, but the old 41 had a lot of hacking going on because it was more of an open platform. There was something called synthetic programming, and there was a crowd that evolved around it. I was actually a member of that crowd, the diehard HP users."
Update: Mr. Nass also made a short video discussing the teardown, available at the EE Times trade journal site.
HP 35s at HP