Texas Instruments TI-73 Explorer Manual Book page 317

Appendix A: Function and Instruction Reference
ZInteger
(
Z O O M
@X=1 @Y=1 Xscl=10 Yscl=10
Zoom In
(
Z O O M
Move the cursor, and press
b to select new center point.
X and Y values now
increment by 1.
b
311