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HP Forum Archive 16

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12C confusion
Message #1 Posted by Egan Ford on 9 Aug 2006, 12:26 p.m.

Is there a link someone can point me to that has a complete description of all the different 12Cs? E.g. original vs. new vs. platinum vs. anniversary platinum, functions, quality, speed, ...

Thanks.

      
Re: 12C confusion
Message #2 Posted by Vieira, L. C. (Brazil) on 9 Aug 2006, 4:00 p.m.,
in response to message #1 by Egan Ford

Hi, Evan;

AFAIK, there is one standard (gold) HP12C that had at least five different internals, maybe more. The first one when the HP12C was introduced, with flex circuit and two ICs. Later, an updated version with single PCB and no flex circuit and the same basic electronics. Then I remember seeing at least two upgrades with different PCB layout, one of them with an Agilent chip. All of these use three LR44-type batteries. Then there is the last version with a single 3Vcc battery. Im not sure if this last version had an upgrade.

After that, there are three different HP12C Platinum: first series, with some problems; second series with parenthesis, back space and undo; and the 25th. aniversary eddition. And there is the HP12C Prestige, sold in Brazil. The HP12C Prestige is essentially a regular, second series HP12C platinum with a new look, as it is the 25th. aniversary eddition. One small remark: the first series HP12C Platinum and its immediate upgraded predecessor can only be differentiated by looking at the [STO] and [RCL] keys, where one can see the parenthesis printed in blue, in the front, slanted face of these keys. Undo and backspace can also be seen in the [] and [-] keys, respectively.

Major differences are:

                         Operation  Mem prgm  CashFlow Extras
HP12C Gold                RPN         99 stp    21
HP12C Platinum (first)    RPN+ALG    399 stp    31
HP12C Platinum (second)   RPN+ALG    399 stp    81     ( ) [<-] undo
HP12C Plat 25th. aniv.    RPN+ALG    399 stp    81     ( ) [<-] undo
HP12C Prestige            RPN+ALG    399 stp    81     ( ) [<-] undo

Hope this helps.

Luiz (Brazil)

Edited: 10 Aug 2006, 9:43 a.m. after one or more responses were posted

            
Two extra characteristics... HP12C Platinum
Message #3 Posted by Vieira, L. C. (Brazil) on 10 Aug 2006, 8:04 a.m.,
in response to message #2 by Vieira, L. C. (Brazil)

I forgot to mention. The three new models - 2nd-series Platinum, 25th aniversary eddition and Prestige - allow LCD contrast control:

[f][+]    darker
[f][-]    lighter
Just that.

Cheers.

Luiz (Brazil)

Edited: 10 Aug 2006, 8:04 a.m.

            
Re: 12C confusion
Message #4 Posted by Egan Ford on 20 Aug 2006, 3:46 p.m.,
in response to message #2 by Vieira, L. C. (Brazil)

Thanks. I'll just stick with my 1981 12C.

                  
Re: 12C confusion
Message #5 Posted by Vieira, Luiz C. (Brazil) on 20 Aug 2006, 10:59 p.m.,
in response to message #4 by Egan Ford

Hi, Egard;

I am an Electrical Engineer and I own many HP calculators. In the financial area, I mainly act as a teacher, being Financial Math the main subject. I have one of each of the following: HP10BII, HP14B (Pioneer, original... good girl!), HP17BII, HP17BII+ and HP19BII. I also have two HP38C, one HP38E and one HP37E.

When teaching specific HP12C courses, I like to have some extra calculators with me in the classroom (there are always some students without calculators...), so I have four HP12C (one with three batteries, earlier nodel), four HP12C Platinum (one of the new series) and one HP12C Prestige (I'm waiting for a 25th. Aniv. unit). If I have to take only one of these with me for personal use, I take one of the three first-series Platinum and leave the others 'safe', at home.

Maybe having a newer Platinum in the pocket and leaving a 1981 HP12C at home is safer.

But this is just a thought of mine; please, if you do not feel like buying a new HP12C Platinum, simply disregard this suggestion.

Best regards.

Luiz (Brazil)

Edited: 20 Aug 2006, 11:01 p.m.


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