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The game of NIMB is an old calculator game. You start with 15 sticks in a pile and take turns removing 1, 2, or 3 sticks. The object is to leave the pile with only 1 stick remaining to make your opponent take the last stick.

Instructions:
0) Key the program in. Switch to RUN mode and press f PRGM.
1) Store these constants: -1 STO 0, 55178 STO 3 (This is "BLISS" when viewed upside down), 3507.1 STO 2 (I.LOSE upside down).
2) Set the display mode to FIX 0 and press R/S. 15 will be displayed (this is the number of sticks on the pile).
Note: The next two steps are exactly backwards from the HP-55 Nimb game on my site!
3) A negative display means that it is your turn. Remove either 1, 2, or 3 sticks from the pile (by entering 1, 2 or 3) and pressing R/S.
4) A positive number will be shown indicating the number left on the pile and that it is the HP-25's turn. Press R/S to give the machine a turn.
5) Continue with steps 3 and 4 until either BLISS or I.LOSE is displayed upside down. For a new game, goto step 2.

Line      Instruction  Keycode
01         ENTER        31
02         f INT        14 01
03         g ABS        15 03
04         f X NE Y     14 61
05         GTO 22       13 22
06         g X = 0      15 71
07         GTO 22       13 22
08         4            04
09         X <> Y       21
10         f X > = Y    14 51
11         GTO 22       13 22
12         RCL 1        24 01
13         +            51
14         CHS          32
15         STO 1        23 01
16         g X < 0      15 41
17         GTO 46       13 46
18         g X = 0      15 71
19         GTO 46       13 46
20         R/S          74
21         GTO 25       13 25
22         RCL 0        24 00
23         f SQRT       14 02
24         GTO 46       13 46
25         RCL 1        24 01
26         1            01
27         -            41
28         g X = 0      15 71
29         GTO 48       13 48
30         4            04
31         /            71
32         f INT        14 01
33         4            04
34         *            61
35         1            01
36         +            51
37         f X = Y      14 71
38         GTO 40       13 40
39         GTO 42       13 42
40         1            01
41         -            41
42         CHS          32
43         STO 1        23 01
44         R/S          74
45         GTO 01       13 01
46         RCL 3        24 03
47         GTO 00       13 00
48         RCL 2        24 02
49         GTO 00       13 00