Files with 83m extension are associated with TI-83 Plus graphing calculator.
83M file extension - Texas Instruments TI-83 matrix file
What is 83m file? How to open 83m files?
File type specification:
The 83m file extension is related to the TI-83 Plus, an easy-to-use graphing calculator for math and science that lets students graph and compare functions, as well as perform data plotting and analysis. Its FLASH™ ROM memory allows students to update and add software applications (Apps).