Be smart, stay dumb.

Back to the sheet Office Calculator · D4
Photo
D4 · Level 1 · Electric, no logic An electric rock

Olivetti Divisumma 24

Olivetti Divisumma 24 electromechanical printing calculator, 1956.

$100–300Buy on eBay
Estimate. Prices change.

Marcello Nizzoli again, this time for arithmetic: a motor drives a forest of cams and levers that print the answer on a paper roll. A museum piece that still works on a desk.

Repairable
Opens with common tools, spare parts are available, and replacement parts work without the maker unlocking them.

Where to buy

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Survival checklist

What it survives, next to the smart one it replaces.
1
=SURVIVES(threat)Survives…
ThisOlivetti Divisumma 24
What it replacesSmart oneAsking Alexa
2
Power cut
FALSE
FALSE
3
Wi-Fi goes down
TRUE
FALSE
4
The company switches off its servers
TRUE
FALSE
5
Someone tries to hack it
TRUE
FALSE
6
A firmware update goes wrong
TRUE
FALSE
7
Twenty years from now
TRUE
FALSE
8
=COUNTIF(TRUE)Total
5 of 65/6
0 of 60/6

The smart one is the Asking Alexa.

Row 4

See it in the sheetIn the sheet
Photo You are here

Nizzoli’s electric calculator. Motors and cams, no chips.

Olivetti Divisumma 24

$100–300
Repairable
Olivetti Divisumma 24$100–300
Buy on eBay