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HP-12C Platinum Version 02 calculator from 2010 week 21?
07-10-2015, 06:43 PM (This post was last modified: 07-10-2015 07:04 PM by jebem.)
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RE: HP-12C Platinum Version 02 calculator from 2010 week 21?
(07-09-2015 11:39 PM)rprosperi Wrote:  This has never been clearly and fully documented, to some extent, because the history of the 12C is far longer than any single person in the HP Calculator group.

Also the most recent 12C and 12CP models used the same CPU as other models recently discontinued (e.g. 20b/30b) due to lack of parts from CPU supplier, from which we can infer that another "version" is coming. And while HP's intent is to keep differences invisible to customers, as you've seen with the benchmarks, careful scrutiny by communities like MoHPC will eventually find minor differences.

Thank you, Rob!

I keep reading the old forums and found some additional interesting reports.

In this post (Msg#18), Gene Wright suggests a small looping program to measure how fast the processor is.

Enter this looping program. Press:
shift P/R
shift CLPRGM
+
shift GTO 001
shift P/R
1 ENTER ENTER ENTER ENTER CLX
shift GTO 000
R/S and let it run for 60 seconds. The number in the display is the important one.


My calculator gives me a total count of about 1400.
So it doesn't seems to be using the faster ARM processor, or if it is, it is emulating the original 12C speed, as others reported about the same final count on their machines.
Probably HP used the Sunplus processor in these machines produced in 2010, despite using two CR2032 cells in the battery compartment.

I really have to open this machine one of these days to clarify this issue.

[Image: HP-12C_Platinum_Ver_02_014.jpg]


In another post here (Msg#28), Katie has taken current consumption readings on a HP-12C, alleged using the faster ARM processor.

Some of the Katie's readings in April-2009, were:
power off: 4uA
power on, static display, no keystrokes: 45uA
tight program loop: 15mA

On my machine of 2010, the readings are different:
Power off: 0uA
Power on, static display, no keystrokes: 10uA
Tight program loop: 1.4mA


Also on this same post (Msg#22), Gene reports how fast is this new calculator they were testing at the time (April-2009) by using the tight loop test:
Program of
01 + 02 GTO 01
with the stack filled with 0 in X and 1 in Y, Z and T
counts to well over 45,000 in 60 seconds.


This final count of 45000 means that that calculator of 2009 was about 32 times faster than my calculator of 2010, and to do that it was consuming about 11 times more current than mine.


Here are the photos of my HP-12C Platinum calculator of 2010 while taking current readings:

Powered ON, Idle state: 10uA

[Image: HP-12C_Platinum_Ver_02_015.jpg]


Powered Off: 0uA

[Image: HP-12C_Platinum_Ver_02_016.jpg]


Running the looping program from above: 1.4mA

[Image: HP-12C_Platinum_Ver_02_017.jpg]

Jose Mesquita
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RE: HP-12C Platinum Version 02 calculator from 2010 week 21? - jebem - 07-10-2015 06:43 PM



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