Summit SI-90

Summit SI-90
Image: used with permission
The Summit SI-90 is a scientific calculator with 10 digits precision and algebraic logic. It has 20 functions, 36 keys, and an LED (light-emitting diode) display, typical of calculators of this era. The power source is Sealed battery pack.

Facts at a glance:

Feature Value
Type: Scientific
Functions: 20
Keys: 36
Precision: 10
Logic: Algebraic
Display type: LED
Length: 203mm
Width: 83mm
Thickness: 38mm
Power Source: Sealed battery pack
Year introduced: 1974
YearDiscontinued: 1974

See other calculators by Summit