It depends on what version(s) of TI calculator you are using.
Consult your manual, or give us more information.
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Texas Instruments TI-30xIIS calculator?
When using the TI-83 or 84, you connect the wires that should come with the calculator. Then, you must press Second and the button down 1 and right 1 on both calculators. On the receiving calculator, press the right arrow key and then Enter. On the sending calculator, select the programs you want to send and press Enter.
One can purchase a TI-83 calculator in online stores such as Amazon or eBay. In addition, stores such as Walmart or Costco will sell the calculator model.
yes
2nd on