2 ms·

I had the Hp15c (and still have) but always deeply longed for the hp28s, which was the first to implement a lisp-like programming language in a calculator. Had

• threwrfaway 4mo ago
  The HP28s is amazing. The manual even has a program to convert an algebraic expression to rpn. In high school it was mind blowing. But I didn't do anything serious with programming. Normal languages seemed annoying, usr/rpl useless limited as it was to a 4 bit calculator. Maybe if someone had told me usr/rpl is just lisp. But, it's for the best. I loath computer screens today.
• fsagx 4mo ago
  I still have my 28s from the late 80s. Also really rugged except for the achilles heel of a battery door.
  • kickingvegas 4mo ago
    Same. HP should sell a replacement battery door. (Edited) Actually it's not so much the door but the housing.