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Can anyone check this strange behavior on HP-15C



#6

I have an HP-15C. I wrote the following program (a nimb game):

LBL A:				01 - 42, 21, 11
1 002 - 1 Start with 15 sticks
5 003 - 5
LBL 0: 004 - 42, 21, 0
R/S 005 - 31 User enters no of taken sticks
ENTER 006 - 36
INT 007 - 43, 44
ABS 008 - 43, 16
X =/= Y: 009 - 43, 30, 6 Make tests for correct insert
GTO 1 010 - 22, 1 GTO 1 -> Error!
X == 0: 011 - 43, 20
GTO 1 012 - 21, 1
CLX 013 - 43, 35
4 014 - 4
X <= Y: 015 - 43, 10
GTO 1 016 - 22, 1
ROLL DOWN 017 - 33
- 018 - 30 Calculate left sticks
X <= 0: 019 - 43, 30, 4
GTO 2 020 - 22, 2 Nothing left -> User lost
PSE 021 - 42, 31 Show left sticks
ENTER 022 - 36
1 023 - 1
- 024 - 30
X == 0: 025 - 43, 20
GTO 3 026 - 22, 3 If computer takes last -> user won
4 027 - 4
/ 028 - 10
INT 029 - 43, 44
4 030 - 4
* 031 - 20
1 032 - 1
+ 033 - 40
X =/= Y: 034 - 43, 30, 6 If possible take optimal no of sticks
GTO 0 035 - 22, 0 -> next round
1 036 - 1
- 037 - 30
RAN # 038 - 41, 36 Otherwise, take random no of sticks
3 039 - 3
* 040 - 20
INT 041 - 43, 44
- 042 - 30
GTO 0 043 - 22 0 -> next round
LBL 1: 044 - 42, 21, 1
0 045 - 0 -> Error!
LN 046 - 43, 12
LBL 2: 047 - 42, 21, 2
5 048 - 5 Show BLISS
5 049 - 5 -> Computer has won
1 050 - 1
7 051 - 7
8 052 - 8
RTN 053 - 43, 32
LBL 3: 054 - 42, 21, 3
3 055 - 3 Show ILOSE
5 056 - 5 -> User has won
0 057 - 0
7 058 - 7
1 059 - 1
RTN 060 - 42, 32

It's a rewrite from the program from Genes HP.

The rules are easy:
1) Start the program.
2) 15 is shown.
3) Enter no of sticks you will take (1, 2 or 3).
4) DO _NOT_ CONFIRM WITH ENTER
5) press R/S.
6) The no of remaining sticks will be shown for a short time.
7) The no of sticks remaining after the turn from the computer is shown.
8) Go on by step 3)
9) If you do a wrong insert, Error 0 is shown, you lost.
10) If you have won, ILOSE is shown (upside down).
11) If you lost, BLISS is shown (upside down).

Now, my problem is the following: If I start by taking 1 or 3 sticks, all works fine and I lose.
But if I start by taking 2 sticks (the only chance to win the game), the computer will not take any stick. It seems that the test in line 34 does not evaluate right. But If I step the program, all works fine.
In the second round (and in all following) it than seems, that the ENTER in line 22 will not be executed right (so the test in line 34 fails again). Again, if I step the program, this happens not.

I guess that something may be weak in my computer, but what? It seems not to be the test (in line 9 it works very well, and replacing X =/= Y in line 34 by X >= Y doesn't changes anything). It also seems not to be the ENTER key, because in line 6 it works well and in the usual calculating also.

Or did I misunderstood something in the way my computer works and did a mistake in the program? Can anyone check this?

Has anyone a idea what could make this behavior?

Thanks, Bastian.


#7

Quote:
But if I start by taking 2 sticks (the only chance to win the game), the computer will not take any stick.

Perhaps your 15C is a poor sport. :-)

Can you post the original source that you used as the basis for your code?

Update

I added an extra ENTER after line 22. Seems to work with 1, 2, or 3 as a starting number.

001   LBL A     014   4         027   GTO 3     040   3         053   8         
002 1 015 x<=y 028 4 041 x 054 RTN
003 5 016 GTO 1 029 / 042 INT 055 LBL 3
004 LBL 0 017 Rv 030 INT 043 - 056 3
005 R/S 018 - 031 4 044 GTO 0 057 5
006 ENTER 019 TEST 4 032 x 045 LBL 1 058 0
007 INT 020 GTO 2 033 1 046 0 059 7
008 ABS 021 PSE 034 + 047 LN 060 1
009 TEST 6 022 ENTER 035 TEST 6 048 LBL 2 061 RTN
010 GTO 1 023 ENTER 036 GTO 0 049 5
011 x=0 024 1 037 1 050 5
012 GTO 1 025 - 038 - 051 1
013 CLx 026 x=0 039 RAN# 052 7
Please post the original code.


Edited: 16 Mar 2008, 1:09 p.m.


#8

The original source can be found here: http://www.rskey.org/gene/calcmuseum/25nimb.htm. But it is for the HP-25.

Now, it also works on my computer. Can you explain why this change is needed? I don't see it.

Thank you very much

Bastian


#9

Quote:
Can you explain why this change is needed? I don't see it.

I do not recall exactly, but I remembered having a similar problem that did not present itself when using R/S. The solution was the same, an extra ENTER.

#10

Ohh noo!! I see it.

The [ENTER] copies the content of the X register to the Y register. But then the stack will be disabled. If I would use a function now, like [x^2] or anything else (with one argument) the function would enable the stack again and use the copy in the X register for the operation. But I enter a [1] in the next step and so my copy in the X register will be overwritten. After performing [-] on X and Y I lost my copy in the Y register, of course!

But when I stepped the program, every time after the [ENTER] was executed, I checked the content of the Y register by pressing [X <-> Y] two times. But this operations have enabled the stack again, and so the next command ([1]) didn't overwrite the content in the X register, but shifted it. And so my lost copy was stored in the Z register as it should be and all worked fine.

Bastian


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