The Casio I used in college was much like that. It was the scientific one, forget the model number, with additonal keys on the fold out side. That was probably my all-time favorite calculator. It had all the common physical constants in it, plus it did logic, converted number bases between dec, hex, bin, and octal, converted between english and metric, and of course had all the requisite math and science functions. No graphing or programming, but didn't need that at the time. It was still my go-to years after graduation, until my first born decided to 'hide' it one day by putting it on top of a lamp where it wasn't immediately noticed, until the plastic had melted through and destroyed the secondary keyboard.
I did learn how to use HP and their RPN, because if your calculator broke down in the midst of an exam, our one professor was all too happy to lend you one of his - except they were all HPs. I know more than one classmate got caught out by this. But my Casio never failed. It took a 75 watt light bulb to kill it.
I remember those Sharp pocket computers (mostly from Radio Shack, not the original Sharp versions), but the one I actually had, the Radio Shack PC-4, was actually a Casio as well. I wish I had found it when cleaning out my Mom's house, but I must have lost it in a move long ago. The neatest thing I did with it was utilize the cassette motor control relay to drive a bigger relay in a box full of D cell batteries to launch model rockets. They always look better if you can stand way back, but the stock launch controllers only had maybe a 20 foot cord, plus it used AA batteries which gave you maybe half a dozen launches. With my controller box plus a program in my pocket computer, my friend and I could BOTH stand back and watch.
I have to say, kind of a shame to see this one destroyed, but it is also interesting to see how they pulled it off. More amazing when you consider when it was made. A calculator that thin would still be a marvel today. And to be made so cheaply it could be used for business promos.