This video is about the TI-66, the successor to TI-58/59 from the late 70s.
The TI-66 was manufactured by Toshiba, after the failure of Texas Instrument's own TI-88 project which was originally slated to be the TI-58 and TI-59's successor. See http://www.datamath.org/Sci/Slanted/TI-88.htm
For more information about the TI-66 check out the following links:
- http://edspi31415.blogspot.com/2019/09/retro-review-texas-instruments-ti-66.html?m=1
- http://www.datamath.org/Sci/Galaxy/TI-66.htm
- http://ganjatron.net/retrocomputing/ti-66/index.html
For more calculator videos, check out my channel https://youtube.com/CalculatorCulture