Teresio Gassino
IT

Logos 27

«A jewel of ingenuity and creativity».

Graphic design by Giovanni Pintori for the Logos 27 PDF

The Logos in four articles in notizie olivetti (Italian, multilingual pdf available*).

  • The Logos and the calculating machine market. An article by Francesco Mascaro, of the Olivetti Study Centre.
  • The Logos 27 project. A note by Teresio Gassino, who designed the machine together with a team of collaborators.
  • The design of the Logos 27. An article by architect Ettore Sottsass jr., who conceived the exterior of the new Olivetti calculator.
  • “Where the Logos 27 is made”.

Source: monthly company magazine notizie olivetti, n. 85, dicembre 1965, Ufficio Stampa Olivetti, pp. 32–49. *Translations of the first three articles from the final section of the magazine (unpaginated, without images).

Cover of the Logos 27-2 information brochure PDF

Olivetti Logos 27-2, brochure (1967) with an operational logic diagram.

A brochure featuring graphic design by Giovanni Pintori showcased the Logos 27-1 version (1966, pdf available in Dutch). A video sequence showcased the Logos along with other Olivetti products (link).

Source: Olivetti Logos 27-2, Internet Archive, Olivetti Logos 27, Letterform Archive, accessed in November 2020.

Overhead view of the Logos 27’s mechanics ↗ Link

Ranimer une belle mécanique, la super-calculatrice Logos 27-2 (“Reviving a piece of beautiful mechanics”, 2013, French).

Philippe Bastide, an engineer and enthusiast of mechanical calculating machines, details his analysis and reverse-engineering attempt on the Logos 27-2, to restore it to working order. Alain Billerey’s expertise contributed to this effort—himself an enthusiast and collector of such machines (he can be seen at this video link, demonstrating the Logos, Divisumma and Tetractys from his collection in operation).

Source: L’oeil numérique (Internet Archive), archived in July 2019.

Cover of the Einstellungen adjustment manual ↗ Link

Olivetti Logos 27 Einstellungen, adjustment manual (1968, German).

STAC technicians (Servizio Tecnico Assistenza Clienti, Olivetti’s own customer technical service) had, besides the adjustment manual, a Parts Locator guide (1969, link) with spatial coordinates for locating sections of the machine and precisely diagnosing a malfunction using the fault-search manual (Logos 27-2 Fehlersuche, 1968, link in German).

Source: Internet Archive, links accessed in August 2026.