Texas Instruments TI-73 - Various (TOSEC-v2006-04-21)

"TI-73 series are graphing calculators made by Texas Instruments.

The original TI-73 was originally designed in 1998 as a replacement for the TI-80 for use at a middle school level (grades 6-9). Its primary advantage over the TI-80 is its 512 KB of flash memory, which holds the calculator's operating system and thereby allows the calculator to be upgraded. Other advantages over the TI-80 are