No, the TI51s were out by then. Those were the item to have. Of course, I was stuck with a slide rule throughout high school.
I'm probably thinking back to Sophomore (75?) year then, so they were prob those units. I remember them being all the rage, and the $200 price tag seems right.
I still remember in my Senior (77) year that the class "business machines" still had rotary calculators next to the new electronic ones. My teacher insisted we use the old rotary machines.