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Gene!

The program presented below will play the game of Nimb on the HP-55. It was written by Richard Emery and appeared in the V4N4P10 issue of the PPC Journal (April 1977). Thanks Richard!

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.

1) Store these constants: 55178 STO 1 (This is "BLISS" when viewed upside down), 3507.1 STO 2 (I.LOSE upside down).

2) Press the BST key and press R/S. 15 will be displayed (this is the number of sticks on the pile).

3) A positive 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 negative number will be shown indicating the number left on the pile and that it is the HP-55'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 FIX 24 02 0 00 03 1 01 04 5 05 05 R/S 84 06 - 51 07 1 01 08 X <> Y 22 09 g 32 10 X = Y -45 11 CHS 42 12 R/S 84 13 CHS 42 14 1 01 15 - 51 16 3 03 17 X <> Y 22 18 f 31 19 X < = Y -41 20 6 06 21 g 32 22 X = Y -14 23 CLX 44 24 7 07 25 g 32 26 X = Y -39 27 CLX 44 28 1 01 29 0 00 30 g 32 31 X = Y -14 32 CLX 44 33 1 01 34 1 01 35 g 32 36 X = Y -39 37 RDN 23 38 GTO 05 -05 39 2 02 40 - 51 41 GTO 05 -05 42 RCL 34 43 1 01 44 GTO 00 00 45 FIX 24 46 1 01 47 RCL 34 48 2 02 49 GTO 00 00

That's it!

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