HP-12c 'comma' variant (?brazil)

[dm319]

There looks to be a variant of the HP-12c being sold in Brazil which has markedly different algorithms to the regular HP-12c. I came across it on this reddit thread, and when tested with these calculations it exhibited very different abilities to the regular HP-12c or HP-12c platinum.

Here are the overall accuracy results:

Code:

|calculator                  |1    |1b   |2    |3    |4    |5A   |5B   |6A   |6B   |7    |8    |9    |10   |11   |12   | median|   mean|
|:---------------------------|:----|:----|:----|:----|:----|:----|:----|:----|:----|:----|:----|:----|:----|:----|:----|------:|------:|
|HP-12cp                     |12.4 |11   |11.7 |12.2 |11.1 |ERR  |ERR  |ERR  |ERR  |21.4 |12.2 |3.2  |3.5  |11   |2.8  | 10.972|  9.031|
|HP-12c                      |9.6  |8.6  |8.8  |10.6 |9.1  |ERR  |ERR  |ERR  |ERR  |19.7 |11.5 |1.7  |1.6  |4.6  |1    |  8.278|  7.337|
|HP-12c comma                |9.6  |9.5  |11.7 |7.2  |ERR  |8.7  |NA   |8.4  |NA   |ERR  |12.2 |3.2  |3.2  |NA   |NA   |  7.182|  7.027|

And here are some of the results obtained:

Code:

| calculator     | 1               | 1b            | 2            |
|----------------|-----------------|---------------|--------------|
| HP-12c         | -1368.148355    | 4.37321837    | 6803.092172  |
| HP-12cp        | -1368.14835535  | 4.3732183723  | 6803.092162  |
| HP-12c comma   | -1368.148355    | 4.373218372   | 6803.092162  |

| calculator     | 3              | 4                   |
|----------------|----------------|---------------------|
| HP-12c         | 331667.0067    | -7.983367984e-10    |
| HP-12cp        | 331667.006691  | -7.98336798336e-12  |
| HP-12c comma   | 331666.9849    | ERR                 |

| calculator   | 5           | 5A          | 5B  |
|--------------|-------------|-------------|-----|
| HP-12c       | ERR         | ERR         | ERR |
| HP-12cp      | ERR         | ERR         | ERR |
| HP-12c comma | 14.43587133 | 14.43587133 | ERR |

| calculator    | 7                  | 8               |
|---------------|--------------------|-----------------|
| HP-12c        | 2.181818182e-10    | 3.125004736e-6  |
| HP-12cp       | 2.18181818182e-10  | 3.125001e-6     |
| HP-12c comma  | ERR                | 3.125001e-6     |

You can see it is not coming up with answers for some of these problems, but it is also able return results for double root solutions that the regular HP-12c and HP-12c platinum can't.

Just wondering if anyone else has come across this version? It definitely seems to be a bit of a curiosity - I wonder how official it is.