HP 28C Scientific Calculator from 1987 - A new beginning

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My HP 15c scientific calculator. I got it as a birthday present from my dad back in 1983 when I turned 16. It helped me through high school, was there when I

epocalc - HP

HP 28C Scientific Calculator from 1987 - A new beginning

HP 28C Scientific Calculator from 1987 - A new beginning

Buy HP 28S Scientific Calculator online

HP28S - Creating Custom Menus

Ten classic electronic calculators from the 1970s and 1980s • The Register

HP 28C Scientific Calculator from 1987 - A new beginning

The HP 28C: HP's First Graphing Calculator - HP History

HP 28S Scientific Calculator for sale online

HP Computer Museum

HP 28S Scientific Calculator for sale online