You might remember this way back from the mists of time (if you are 30 or under forget it!) the Little Professor. Millions and millions were sold in the past 25 years it's a very simple but funny educational product. The basic idea behind the Little Professor is opposite to a normal calculator: The child has to type the answer of simple questions like " 3 + 5 = ? ". You can choose between the four basic maths functions and four different skill levels. If the child gives a wrong answer "EEE" occurs, otherwise another of more than 16000 different questions is asked.
This educational toy was designed by Texas Instruments for childrens aged between 5 and 9 years. And I loved it, as my dad worked for texas Instruemnts in Bedford. I however did not have a speak and Spell. Why I don't know ? I always wanted want one and when my child was younger I bought him one of ebay . And of course I bought him a Little Professor as well. It just goes to show you that retro can work , I think toy manufactors need to look back in order to go forward. Texas Instruments was way ahead of their time I loved it.