Old Calculator Web Museum Documentation Archive
Friden EC-130 Version 2 MDD (Master Design Documentation) Definition, April, 1965
Friden EC-130 MDD Definition (April, 1965)
This document defines the structure of the "Version 2" Master Design
Document (MDD) that describes the entire design of the Friden
EC-132 electronic calculators.
It appears that after the
first version of the MDD
was published for the EC-130, some re-thinking of the structure of the
MDD was done, and a new structure was devised. It is based on the earlier
MDD structure, but refining it to be more concise and consumable
by human beings. Foremost
in the changes was renaming of most all of the signal names, shortening
them to four or five characters, along with changes to the logic definitions.
This document contains mappings of the old signal names to the new ones,
along with desciptions of some (but not all) of the fields in the Version 2
MDD printouts. The definitions were intended to define enough of the
information in the MDD for service technicians to be able to use the
document to track down faults to the component-level. The document provides
an example of fault isolation to help aid in understanding the MDD.
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