First calculator handling fractions

[Steve Simpkin]

I *believe* the first HP that could natively work with fractions was the HP-32SII which was introduced in 1991.
http://www.finseth.com/hpdata/hp32sii.php

   

Note that the HP-48SX introduced a year earlier had the ->Q function which could convert a real number to a fractional algebraic expression. I don't consider this a native support of fractional entry and display as we are discussing here.