Your old TI graphing calculator still costs a fortune, here's why (magazine article)

[Hlib]

In 1999-2002 I used TI-83 Plus. 24 Kb of user-available RAM and 163 Kb flash (also programmably accesible), normal working capacity within 6.4... 3.2 V, high-contrast display and reliable keys, 20 mA of maximum consumption. $100 for such calculator in present time it is inexpensive. IMO, the student has to spend the main time for the fundamental study with the help of calculator, but not on studying of the confused concepts from developers of calculators and their defects.