Re: 33s bug list (A START) Message #2 Posted by Mike on 19 May 2004, 2:00 p.m., in response to message #1 by Dave Olson
Here is a pretty good start gleaned from this forum. (Sorry I did not cite the sources, all of whom are much smarter than I)
*****FRACTION ANONALY IN PROGRAM MODE
If you try to enter a fraction in PRGM mode it comes out with commas in the wrong place. Try this: enter program mode and enter the fraction 1234/567. It'll come out looking like this: 12,34/,567. If you enter the same fraction on RPN or ALG mode it works just fine. (My newer 33s does not do this, older model may)
****
STAYS IN RAD AFTER RESET
I realized today while doing my physics homework that my calculator was operating in radians mode, even though the RAD annunciator was not on. I did a bit of research, and realized that if you use the selftest (C and 1/x), the LCD screen reverts to its default state (only says RPN), but the calculator does not revert to the default state.
*****
SWAP FUNCTION DIFFERENT IN OLDER AND NEWER MODELS
In algebraic mode
Press:
24 divide 12 X<>Y ENTER and what do you get?
Does your HP33S show 0.5?
or
Do you get a divide by zero error?
The older (first run Calculators, SN CNA40…) result in 0.5, while the newer CNA41… result in divide by 0 error.
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ALL CLEAR PRODUCES ODD DISPLAY
Switch to algebraic mode, and make sure the stack/display is clear by pressing the <C> (ON) key.
Press: 24 then press the Minus key.
Your display should have "24" in the top line and "24.00" (assuming FIX 2) in the bottom line.
Now clear the calulator's memory by pressing the green <leftshift> key, followed by the <clx> key (you know, the <backspace> key just below TAN). Using the big "wobble" key, navigate to: 3ALL, and press <ENTER>. At the "CLR ALL? Y N" prompt, navigate to "Y" and press <ENTER>
Finally, press: 24 then press the ADD key. What do you see? On my calculator, the top line is "24+" and the bottom line is "24.00". What's up with that?!?
Here's another one in alg mode:
Press: 24 then press the Divide key.
Your display should have "24/" (/ is the divide symbol) in the top line and "24.00" (assuming FIX 2) in the bottom line.
Now clear the calulator's memory by pressing the green <leftshift> key, followed by the <clx> key (you know, the <backspace> key just below TAN). Using the big "wobble" key, navigate to: 3ALL, and press <ENTER>. At the "CLR ALL? Y N" prompt, navigate to "Y" and press <ENTER>
Finally, press: 24 then press the Divide key (or the Multiply or Minus or Plus key). What do you see? On the newer calculator, the top line is "0/" and the bottom line is "0.00". BTW, if you had pressed the any of the other keys (Multiply, Minus, or Plus), the top line would be "0x", "0", or "0+", respectively, and the bottom line is "0.00").
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COMPLEX NUMBER ANOMALY
Do a complex function in ALG Mode. Say, (3 +4 CMPLX) x (4 + 5 CMPLX). Now, you know that the real portion will show up in the display like "Re= 8" and you have to push the down arrow to see the imaginary part: " Im=31"
So this begs the question: how do you get to the imaginary part in a program? (since the down arrow is not a programmable function). You push x<>y! But look what happens when you do this manually: If you push x<>y, you then see "Re=31" and the top line will say "(31 8i)" If you hit x<>y again, you get back to the "Re=8"; the top line returns to "(8 + 31i).
So, this x<>y is how you can use the results of complex number actions in a program. You STO to a variable, X<>Y, STO to another Variable and carry on from there. Note that only the value is stored in the variablethe "Re" part is stripped (this is consistent with the way the 32sii works, too, with say the results of an equation solve).
*****
PROBABILITY ERROR
2000 Enter 1000 nCr and the calculated result : 1.8099e499
The correct answer is: 2.048151626989490*10^600, which on an HP 33s would be an overflow.
Mike 1111
Edited: 19 May 2004, 3:21 p.m.
