If you look under Casio's website under the category of "Standard Scientific Calculators" (https://www.casio.com/intl/scientific-calculators/standard-m...) they have some calculators where you can see the input and output at the same time and navigate the input with arrows. I had one that was like the "fx-350ES plus" (https://www.casio.com/intl/scientific-calculators/product.FX...) in high school but they have a selection of newer looking models that support the same kind of many-featured (fractions, exponents, integrals, ...) pixel graphic inputs rather than the simple 2 line LCD.