Texas Instruments are known for bringing forward exquisite products that will stand the test of time. TI82 was released in 1992, and the version presented in this picture (Ti83) was released in 1996. The present version is called Ti83+ and has the same functions as the original released.
Ti83 Specifications
6-15Mhz CPU
163KB-2MB Disk Space
32KB -128KB RAM
96×64 pixels, monochrome display.
Connectivity: Link port, 9.6 kbit/s
50 button built-in keypad
4 AAA batteries plus 1 CR 1616 or CR 1620 for backup
and all these for $109 on Amazon