When I got my hand on the Texas Instruments’ Little Professor, I was hooked. The little guy was basically a backwards calculator that quizzed you on Math basics. I begged for one after my friend had one and the biggest issue I had with the Lil’ Professor was that it ran on batteries, which were always in short supply at my house.
This commercial from Texas Instruments, features the learning toys and tools that you were supposed to get after the Little Professor, the Dataman and the TI-30. I never had the Dataman, but it looks like it was the next gen version of the Professor.
The calculator in our house, while not the TI-30, was from Texas Instruments, it was the TI-1000. That died a corroded battery death at some time in the late 1980s, but I replaced it just a few months ago for the bargain price of $5.99.