Re: I have an old 12C HP calculator that uses 3 button...
LR44 or equivalent batteries should be available at just about any electronics store. There are about a dozen Sydneys in the world, is there a Radio Shack store nearby?
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Mar 24, 2013 - Gryphon; Newbie (Posts: 2); Newbie ... My TI84+ will turn on when the on button is pressed, but no other ... i had the same problems but i had a problem with the os maby you can send a new os. at my calc is now all working Very Happy. new projekts (basic): c-compiler 1% / mylib 3% / ultimative gaming lib ...
Sometimes a calculator will lock up or will not respond correctly. ... With thiscalculator, there are two options for draining the capacitor. The option to use is ... A paperclip reset can be performed on all HP 12C calculators with serial numbers before CN11500001. This will ... These calculators will have one CR2032 battery.
Unlike TI calculators, the HP 12c doesn't have or need a CPT button. It knows whether you've made a numeric entry or not. To calculate N, I, PV, FV, or PMT, simply press the appropriate key without entering a number.
The 12C is more expensive and more powerful than the BAII+Pro. The HP is also programmable, which the TI isn't. Starting from scratch (assuming you've never used a calculator before---a somewhat unreasonable assumption) the TI might be easier to learn, at least initially. But after a certain point, the HP will leave the TI behind. The HP is faster and more capable.
There are at least three different versions of the 12C available. There's the original 12C, the 12C Platinum, and the current 12C. The only way to tell the difference between the two non-Platinums is to look at the battery compartment---the original uses three button cells while the newer uses two coin cells. The newer one is MUCH faster. The Platinum, however, can use RPN or algebraic.
Unless your choice is limited to the 12C or the BAII (by the requirement of an exam, perhaps), you might want to look at the HP 20B and the HP 30B. Programmability aside, they're even more powerful and easier to use and faster than the 12C, and the 30B is also programmable.
There are other considerations, of course. Factors such as the feel of the keyboard, the 12C's landscape orientation as opposed to the others' portrait orientation, etc, are all matters of personal preference.
Disclaimer: I own multiple HP and multiple TI calculators. I tend to use HP calculators for calculating, while I use TI calculators to answer questions here at FixYa.
Personally, I'd go with the regular, or the Plus, staying away from the Platinum. There's nothing on the calculator or package to distinguish the Plus from the regular, but the Plus uses two coin batteries while the regular uses three button batteries. The Plus is just like the regular, except a LOT faster.
I had the same problem with my HP 11C. The following solution worked for me.
1. Remove the battery cover.
2. With the batteries in place (i.e. DO NO REMOVE THEM), use a small piece of wire (I used a standard staple bent at one end), short the terminals FOR A BRIEF MOMENT between both ends of the set of batteries (the HP-11C has three). This means somehow inserting the staple such that the contacts in the batteries receptacle are shorted.
3. The flashing will stop. Then push the ON button until the calculator turns on. If it does not work the first time, remove the batteries and resinsert them.
4. You may have to repeat this procedure. I had to do it twice before my calculator worked again.
I get an answer of 366.91 in my 12C as well. You might try either putting in a zero for FV before hitting the [PMT] key, or clearing your registers before doing the problem, as you may be picking up an old value from a previous problem in the FV register.
Turn the calculator off, then press and hold down the .(decimal key) while you press the on button. Doing so again sets the calculator to use the original digit separators in the display
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