Calculating - Olivetti Summa Prima 20 (Decimal)
Back
Next
Sections
Museum Hold Tight! Photos
Walking Weather
Acorn Commodore Sinclair PCN
Calculating
Calculating
Introduction
In The Hand
Addiator
Addmaster
Arithma
Decimeter
Exactus
Reckoner
Addipresto
Bri Cal
Brunsviga
Contex A
Contex B
Olivetti 15 £sd
Olivetti 20 £sd
Olivetti Decimal
Plus
Victor
 
 
 
 
 
 
 
 
Olivetti
Model   Summa Prima 20
Maker   Olivetti
Origin   Italy
Date   1960s
Serial   5571690
 
A version for decimal currency (introduced in Australia and New Zealand in 1966 and in the UK in 1971) .There is a key for half cents or half pennies.
 
A joystick selects subtraction, sub-total, total or number not to be included. The amount is entered, the joystick set if required and the handle pulled forward and released. The amount is printed on a paper roll, in black for individual amounts and in red for the total or sub-total, using a typewriter ribbon.
 
The machine was designed in 1949 and manufactured in the 1960s
 
The machine is easily portable and mechanically reliable.
 
A small leaflet contains user instructions and examples.
 
     
Top of the Page