Mostek MK5011P  
Written by Accutron on 2017-03-12  

Introduced in 1972, the MK5011P is an early variant of the original MK6010 single-chip calculator, developed by Mostek for the Busicom LE-120A handheld calculator. Busicom, a Japanese calculator manufacturer which had previously built large four-function desktop machines based on TTL and core memory, sought to employ LSI technology in their upcoming products. Busicom collaborated with Intel to develop the MCS-4 (4004) chipset, the first commercially available microprocessor. They simultaneously contracted Mostek to develop the MK6010, the first single-chip calculator. These two devices would set the stage for VLSI's dominance, spawning thousands of siblings, descendandants and competing products through the 1970s and onward.

The MK5011P was used in a number of similar four-function desktop calculators, including the Colex 1200LP, Privileg 1200 and Unitrex 1200.


Mostek MK5011P single-chip calculator, grey trace variation.


Mostek MK5011P perforated white ceramic variation, as installed in an Eiko Unitrex 1200 calculator.

This article is part of the [Digital Integrated Circuits] exhibit.

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