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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