Desk Electronic Calculators

Home > Desk Electronic Calculators

Ricoh RICOMAC 1200

Ricohmac 1200

Ricoh RICOMAC 1200

Display is 12 digits, green vacuum-fluorescent tubes.

4 function.

Main integrated circuits - Six medium scale integrated circuits by American Micro-systems Inc. (AMI), date coded about week 42 of 1970.

240 x 278 x 104 mm (9.5" x 11" x 4").

Made in Japan.


Advertising brochure for the Ricomac 1200. "With LSI" [Large-Scale Integration], though requiring six integrated circuits in the chipset this is what would now be described as MSI [Medium-Scale Integration].

With cover removed

The calculator with the cover removed.

Rear view

View from the rear showing the two main circuit boards below the power supply section.

Circuit boards.

The two circuit boards removed.

Circuit boards close up

Close up of the AMI calculator chip set, numbered 409 12001, 410 12002, 411 12003, 412 12004, 413 12005, 414 12006, all date coded to late 1970. On the right are some of the discrete transistors and diodes of the other board.

Ricoh are well known camera and office equipement manufacturers who produced a small number of models of mechanical (see below), desk electronic, and hand-held electronic calculator variously in the period from the late 1960s to the early 1970s.

Founded in 1936 as Riken Kankoshi Co., Ltd. to make and sell photographic materials, it changed its name to Riken Optical Co., Ltd in 1938. In the 1960s the comapny developed rapidly and became Ricoh Co. Ltd. in 1963. It is still in business today and is a major manufacturer of office automation equipment.

In the UK Ricoh calculators were distributed by Decimo.

Ricoh electro-mechanical ten-key add-lister

Ricoh Ricomac 218 ½, electrically powered, mechanical, ten-key add-lister.

Vintage Calculators

Text & photographs copyright, except where stated otherwise, © Nigel Tout 2000-2024.