Until the more recent release of Texas Instruments' TI-Nspire, the TI-89 represented the pinnacle of graphing calculator technology. Its hardware reflected this coveted position, and its calculation capacities were previously unmatched - but like the TI-83 and the TI-84+ before it, it was eventually replaced with an upgrade. The TI-89 came with 256KB of RAM, which was significant for a calculator when it was released in 1998. It also had Flash ROM, like the TI-83+ [...] Read more »