4-level stack manipulation on 12c

[rprosperi]

(03-05-2015 10:51 PM)rprosperi Wrote:  Of course, there are at least 2 different Platinum s/w versions, before and after adding the UNDO and BKSPC. Guess I'll check both.

Very interesting results.

Platinum 12C, Initial Silver face (no Undo), S/N CN32106351 (engraved)

Using Gerson's "HP 12c Platinum" Program, 17 [Enter] 5 [Enter] 17 [Enter] 5 [R/S] ==> -10.00 Incorrect

Platinum 12C, 2nd Silver face (with Undo), S/N CNA 54200944 (sticker)

Using Gerson's "HP 12c Platinum" Program, 17 [Enter] 5 [Enter] 17 [Enter] 5 [R/S] ==> 2 Correct

Platinum 12C, Black face , S/N CNA 125009Y (sticker)

Using Gerson's "HP 12c Platinum" Program, 17 [Enter] 5 [Enter] 17 [Enter] 5 [R/S] ==> 2 Correct

And of course, as you've guessed by now:

Platinum 12C, Initial Silver face (no Undo), S/N CN32106351 (engraved)

Using Gerson's "HP-12C" Program, 17 [Enter] 5 [Enter] 17 [Enter] 5 [R/S] ==> 2 Correct

So the incompatibility was introduced when the 2nd generation "Silver Platinum" was developed, and it seems maintained since then.

Last year I did some testing to compare 12C versions (the normal 1 [+] GTO 01 timed for 1 minute) and discovered to my surprise that the initial Silver Platinum is about twice as fast as the "Improved" Platinum, 6 times faster than the original 12C, but still only 1/25th as fast as the so-called 12C+ (current model).