HP-12C bug
#1

Have you noticed the following HP-12C bug:

Clearing statistical registers CLEAR Sigma in program prevents the "running" message.

For example run the following program

01 CLEAR Sigma

02 GTO 01

and compare to

01 CLEAR FIN

02 GTO 01

This is not a serious bug but a bug anyway I guess.

My HP-12C is year 2003 model (Made in China). Is it the same thing with earlier 12C calculators?

#2

Same thing with my Brazilian 12C s/n 3203B.

Well spotted.

#3

Hi;

I tried a longer program to check if there was no "reset", but it indeed "clears the display":

f CLEAR FIN
f CLEAR sigma
1
2
0
+
g GTO 01
The 120 + sequnce is just for setting the loop longer and allow "running" to appear, if so. But nothing happens, it acts as if the calculator is switched to off. If it is left in ths condition, batteries wold "drain out" without any warning. Mine is a Chinese unit, Serial # CN1180xxxx.

I have a Chinese Platinum (CN3290xxxx) and this "bug" does not seem to happen: the "running" message prevails.

Good posted.

Luiz (Brazil)

#4

Yep! My 1993 Singapore-made 12C does as you describe.

But, the better question is, "What would prompt someone to write such a program?"

-- KS

#5

This was the shortest possible example to show the effect of CLEAR sigma.

CLEAR sigma in any HP-12C program prevents the "running" message. Add CLEAR sigma in the beginning of any HP-12C program and see the effect!



Possibly Related Threads…
Thread Author Replies Views Last Post
  HP Prime graphing bug BruceH 1 1,457 11-19-2013, 08:14 AM
Last Post: Joe Horn
  HP Prime - another cosmetic bug BruceH 3 1,677 11-12-2013, 02:18 PM
Last Post: Ken Shaw
  HP Prime Bug bluesun08 19 5,288 10-14-2013, 10:48 PM
Last Post: Han
  HP Prime bug in EDITMAT Han 7 2,546 09-27-2013, 10:15 AM
Last Post: Han
  [HP 39Gii] - Bug report Jean-Michel 1 1,588 08-28-2013, 10:53 AM
Last Post: Tim Wessman
  Is the HP-35S bug free? Matt Agajanian 22 6,196 07-01-2013, 04:03 PM
Last Post: Andrés C. Rodríguez (Argentina)
  Has anyone reported this bug to HP? Allen L. 4 1,613 01-10-2013, 07:41 PM
Last Post: Manolo Sobrino
  HP-15C Bug with MATRIX 5 Thomas Klemm 17 4,833 02-04-2012, 05:07 PM
Last Post: Paul Dale
  38E/C, 12C, 12CP date arithmetic bug Katie Wasserman 26 5,471 10-19-2011, 08:57 PM
Last Post: Miguel Toro
  Another HP-15C LE bug? Benoit Maag 58 12,260 10-03-2011, 05:26 PM
Last Post: Steve Simpkin

Forum Jump: