TI-83 is really sufficient for most engineering classes I've taken (Computer Engineering and EE courses) and many of my professors simply did not allow calculat

TI-83 is really sufficient for most engineering classes I've taken (Computer Engineering and EE courses) and many of my professors simply did not allow calculators. They pick problems that can be solved by hands, maybe with a few complex number tricks expecting students to know from doing homework or something they'd been picking up from lower-division courses. But TI-84 is, honestly, the only calculator one will ever need. It has the extra functions that 83 doesn't provide and yet it's really enough do almost any practical calculations one have to be done by hands. The rest are just hypes. The last reason is simply brand history. Once everyone owns 83 and 84 and everyone has good review about them, they go for the good review.