The Rogue HP-12c

[AnnoyedOne]

(09-12-2024 10:06 PM)dm319 Wrote:  This suggests the code in this 12c is running natively then, and not running on a NUT emulator?

That is my theory based on the 12CP-like checksum in your Brazillian 12C. I've no proof of that though. Having the firmware image would prove/disprove it with the presence/absence of NUT firmware.

(09-12-2024 10:06 PM)dm319 Wrote:  I feel like I'm repeating myself but this isn't a bug.

I was referring to the "comma" issue not any TVM results. Those are of little interest to me. To you yes. And others maybe. The same with effective digits of precision.

I think the WP34S calculator project has some 34 digits of precision. Fine if you're an astro-physicist wanting to calculate the circumference of the universe to the nearest millimeter. For me (and most engineers in general) 4-6 digits is plenty. For boundary TVM (and some other) calculations the more the better.

(09-12-2024 10:06 PM)dm319 Wrote:  If I do 2 g+X on the platinum I get 4, on the rogue 12c I get 2 x whatever was in x before.

That suggests that the 12CP x^2 functionalty was removed or was never present in your 12C. It doesn't disprove my 12CP firmware adaption theory but it doesn't support it either.

Perhaps HP back-ported code from newer (Saturn) models to the 12C and it "got out into the wild" before testing was complete. Maybe they have the same checksum code. Or Brazillians were unwitting "beta testers".

(09-12-2024 10:06 PM)dm319 Wrote:  Do you know how to check the firmware of the HP-12c platinum?

The same way as for HP-12C+'s, the 15C LE and 15C CE.

From off, hold g and ENTER, then press ON. The display shows 1.L 2.C 3.h or 1.L 2.C 3.h 4.CPu in later 12CP's. Pressing 2 (2.C) should show the firmware information. I believe that 12CP'S have a brief delay (while calculating the checksum?) before showing

Code:


ChE--564Ah
Ver 02
C 2004 hP

[One line at a time--press any key for the next line.]

A1