HP calculator museum: HP 38G student graphic calculator, 1995
The HP 38G is a graphing calculator for high-school math and science teachers and students. Introduced in 1995 at $79.95, it supports aplets, small applications that can be developed as part of the curriculum and can be easily distributed from the teacher’s calculator to the students’. Using aplets, all the students in the classroom can have their calculators programmed identically at the beginning of a lesson. Equations are entered using algebraic format rather than the Reverse Polish Notation (RPN) used by most HP calculators. (RPN is a system for representing mathematical expressions without the use of parentheses.) from HP Museum
I was seeing this calculator when I was at engineer school, but was using a better HP48GX at that time
Bough for 1€ on a flea market!
Some more pictures