These are the calculators-on-steroids from 70s & 80s.
These are the calculators with additional function as educational device & more: scientific programming, database, journal, spreadsheet etc.
These are the calculators in the transition era from calculating to pocket computing in 80s, then personal digital assistant in 90s.
These are:
1976 - Little Professor for math learning.
1986 - Psion Organiser II model XP for (almost) everything.
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