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Ricoh Ricomac 1200 Desktop Calculator

Image Courtesy Martin Willemsen

The Ricoh Ricomac 1200 is an OEM version of the Unicom 1200, manufactured by the Unicom business unit of AMI (American Microsystems), and sold under the Ricoh brand name. Unicom served as an OEM manufacturer for a number of different calculator companies that sold the machines under their own names, including Ricoh, Commodore, and perhaps others. Subtle variances in cabinet and keyboard color schemes were used to differentiate the models marketed by different OEM customers. This calculator was also marketed by Commodore as an OEM customer of Unicom, as the Commodore 412F. The machine was introduced sometime in 1970.

The 1200 is a basic four-function calculator, twelve-digits, fixed decimal, with constant and round-off feature. Electronically, the machine uses an AMI-made LSI chipset, individual tube vacuum-fluorescent display technology, and discrete transistor display drivers. The machine is related to another calculator in the museum, the Commodore C112, a slightly later-version of a Unicom-manufactured machine marketed by Commodore.
Copyright ©1997-2011, Rick Bensene.