We could program it for different classes.
It was a huge advantage. I think almost everyone knew how.
I have EE200 and EEPro on my TI-89. I have not seen another calculator that has Electrical Engineering programs. Many calculators have Biology, Chemistry, etc., but nothing I found that has anything geared towards Electrical Engineering, except for these programs for the TI-89. I did not major in electrical engineering - but am a geek and play around with electronics as a hobby. Are you saying people wrote their own custom programs for different classes they took?