| 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: |
Olivetti Divisumma 28 Operation Guide multilanguage, in PDF format, click here. |
