The Rogue HP-12c

[Surfin]

(10-11-2024 05:43 PM)AnnoyedOne Wrote:  

(10-11-2024 05:29 PM)Surfin Wrote:  Just to check if now we have the cable connection.

If there is one probably not serial or USB.

I guess it´s I2C, also serial but almost sure it´s not the same protocol as used before.

(10-11-2024 05:43 PM)AnnoyedOne Wrote:  

(10-11-2024 04:23 PM)Idnarn Wrote:  In my units, the display shows 1.L 2.C 3.h 4.CPu...

What does "4.CPu" report? The GPLB31A version says "3886160 h2". The "rogue"?

A1

For record, my Prestige reports "4029814 h2"
And also:

Quote:ChE--564Ah
Ver 02
C 2004 hP

But the older Platinum* model, all silver and no Undo button:

Quote:CHE--0EdFH
VEr 01

no '2004 hP' at the end, there is also no 4.CPu, just "1.LCD 2.CHE" options.

[AnnoyedOne]

(10-11-2024 06:56 PM)Surfin Wrote:  I guess it´s I2C, also serial but almost sure it´s not the same protocol as used before.

Maybe so. My 2022 12C+ looks the same. USB (HP-15C CE cable). Confirmed. I've sucked and saved the firmware,

A1

[cheesy]

The 4. CPU value should change each time you run it, pretty sure it’s just reporting the clock speed

[RPNerd]

(10-11-2024 04:59 PM)Idnarn Wrote:  An example of a monochrome LCD that I used recently which was impressive is the one on the Garmin eTrex SE GPS receiver. I believe it's a Sharp memory LCD: https://sharpdevices.com/memory-lcd/
Perhaps some of the Swiss Micro flagship calculators use these displays too.

They do. This is exactly what the DM42 and similar use.

[AnnoyedOne]

(10-12-2024 04:02 AM)cheesy Wrote:  The 4. CPU value should change each time you run it, pretty sure it’s just reporting the clock speed

Could be!

From the GPLB31A datasheet I have

Quote:Max. operating speed: 4.0MHz @ 2.4V - 3.6

...

6.14. Mask Options

6.14.1. 32768 oscillator

1). X’TAL
2). R-oscillator

From the GPL833F datasheet

Quote:Built-in X’tal 32.768KHz oscillator circuit for real time clock function and system operating clock.

Built-in PLL 2.048MHZ/4.096MHZ/8.192MHZ for system operating clock.

So the latter can operate at twice the speed (8MHz vs 4MHz).

If a GPLB31A based HP-12C Platinum/Prestige does show the system clock speed with the 4.CPu item the numbers for them would make sense (around 4,000,000). By contrast a GPL833F one would display around 8,000,000.

I've no idea what the "h2" means though. Could be a chip rev ID. I'd expect the GPL833F to be different if so.

A1

PS: 4,000,000 / 32768 ==> 122 for the PLL (phase locked loop) multiplier.
8,192,000 / 32768 ==> 250

32kHz crystals are usually accurate to ppm (parts per million).

It is possible that the firmware "throttles" the clock speed to save power,

[cheesy]

(10-12-2024 12:42 PM)AnnoyedOne Wrote:  I've no idea what the "h2" means though. Could be a chip rev ID. I'd expect the GPL833F to be different if so.

A1

I'd hazard a guess that it's Hz

[AnnoyedOne]

(10-12-2024 01:24 PM)cheesy Wrote:  I'd hazard a guess that it's Hz

Makes you wish for a Swissmicros clone with a dot-matrix LCD vs a 7-segment one.

A1

[dm319]

(10-11-2024 06:56 PM)Surfin Wrote:  no '2004 hP' at the end, there is also no 4.CPu, just "1.LCD 2.CHE" options.

Same here with the rogue - no 4th option.

[AnnoyedOne]

(10-13-2024 09:34 PM)dm319 Wrote:  Same here with the rogue - no 4th option.

Yeah. That's to be expected. The "4.CPu" menu option is only present in the HP-12C Platinum/Prestige v2 firmware from 2004 or so. The early "silver" Platinum/Prestige models have v1 firmware and thus don't have that function.

Since you've already verified that the "rogue" doesn't have any hidden extra Platinum functions present (e.g. g x^2) that option being absent isn't really surprising. Unless pressing '4' in the menu works anyway (unlikely).

Nor is it a HP NUT emulation per my HP-12C+. You've proven that also.

So what is it? The firmware probably can't be "sucked" (no programmer and/or it is "secured") so still a mystery. At least for now.

A1

[lvt]

(10-10-2024 06:58 PM)dm319 Wrote:  I am so confused now! I thought Platinums were made in China? Does anyone fancy getting hold of one of these and we can scratch our collective heads over another 12c?

My Platinum was made in the Philippines.