TicTacToe in BASIC by Arthur Matteson:
Hope you enjoy this simple game made before anyone knew how to do assembler.

When asked to enter a player's position, enter a number from 1-9 
corresponding to this board:

 1 | 2 | 3
---+---+---
 4 | 5 | 6
---+---+---
 7 | 8 | 9

Both a .89p and .9xp are included in the .zip file.
(Get the buggy beta TI-89 link at http://www.ti.com/calc/docs/link89.htm)

Reach me at awmatt@concentric.net.