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Old Calculator Web Museum Documentation Archive
Monroe 925 Logic and Timing Manual

This original Monroe technical document was donated to the Old Calculator Museum in July of 2015 by Mr. Charles Smith, who was a Monroe Service Engineer for many years. Mr. Smith kindly donated this document, along with a Monroe 920 Calculator in beautiful condition, along with some other documentation relating to Monroe's 925, 925, 950, and 990 calculators. The museum wishes to express its sincere thanks to Charles for his gracious donation.

This document contains logic flow diagrams, timing diagrams, and logic schematics of the Monroe 925 electronic calculator. There is no theory of operation or descriptive text in this document, nor are circuit board layouts or component location information included. The document is purely for consumption by those with an intimate understanding of digital logic and electronic calculator architecture.
The scan of this document was kindly performed by Mr. Dave Beck. Dave also provided a generous monetary contribution to the museum along with scanning of the Monroe documentation. Sincere thanks to Dave for his contributions to the museum.

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Monroe 925 Logic and Timing Charts Manual