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Olivetti Divisumma 28


Brand: Olivetti.
Model: Divisumma 28.
Origin: Ivrea, Italy.
Introduction: 1973, this example built in 1974 (based on datecode on chips) in Italy.
Type: Basic desktop calculator with printer, no display.
Functions: 4-Basic function with memory. Operates only with AC power, no battery support.
Display: No display, only a thermal paper printer with 12 digits and indicators.
Keyboard: 19 "volcano" keys over a single rubber piece with individual switches on the mainboard. There is a decimal point selection sliding switch (0, 2, 3 and 4 decimal places) and the On/Off switch. Also there is a red light indication when an error condition occurs.
Main chips: 2 SGS chips: 2051A and 2052B with date code 7410 and 7421 (around March and June 1974).
Remarks: This is a desktop version of the Divisumma 18 with the same concept of a rubber membrane over the keyboard. The keyboard layout, chipset and operation are identical. This attractive design was also made by Mario Bellini for Olivetti and it is in non-permanent exhibition at the MoMa (Museum of Modern Art) of New York.
Size: 8.28 x 8.86 x 3.20 in, 210 x 225 x 80 mm.
Condition: (7/10) Regular to Good, some marks on rubber membrane. Full working, printer head moves but does not print, probably chemicals on the paper are dead.
Additional readings: Your can read about the exhibition at the MoMa here.
Download: This calculator is identical to the Olivetti Divisumma 18, so you can download the Divisumma 18 multilanguage Operation Manual in PDF format, click here.

 

Some advertisements of the Divisumma 28 I found on the web, click on the thumbnail.

 
   

 


Pictures of my Divisumma 28.

 


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