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HP Forum Archive 14

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HP-12C bug
Message #1 Posted by Kalevipoeg on 7 Oct 2004, 3:43 a.m.

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?

      
Re: HP-12C bug
Message #2 Posted by James Summers on 7 Oct 2004, 8:45 a.m.,
in response to message #1 by Kalevipoeg

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

Well spotted.

            
Re: HP-12C bug - Not with the HP12Cp
Message #3 Posted by Vieira, Luiz C. (Brazil) on 7 Oct 2004, 9:00 a.m.,
in response to message #2 by James Summers

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)

      
Mine, too, but...
Message #4 Posted by Karl Schneider on 7 Oct 2004, 11:13 p.m.,
in response to message #1 by Kalevipoeg

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

            
Re: Mine, too, but...
Message #5 Posted by Kalevipoeg on 8 Oct 2004, 2:05 a.m.,
in response to message #4 by Karl Schneider

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!

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