Commodore US-121P Electronic Printer  
Written by Accutron on 2007-05-13  

The Commodore US-121P Electronic Printer is an obscure printing-only electronic calculator introduced around 1973. The US-121P is based on the Mostek R1200 (MK501x) calculator chipset, and features a two-color impact printer and memory function.


Commodore US-121P Electronic Printer four-function calculator with memory.


US-121P calculator, logic PCB and printer mechanism. The MK501x chipset used in the US-121P was used in a number of calculators from other manufacturers, but usually does not include the MK5015P. Note that the MK5014P has an unusual 'marshmallow' style ceramic carrier.

This article is part of the [Electronic Calculators] exhibit.

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