+**D81** is a designation often associated with a series of foundational [Digital Logic](/wiki/Digital_Logic) units from the mid-20th century. These components were instrumental in the development of early computational systems, providing the core processing capabilities for scientific endeavors and complex data operations within emerging [Computing Machines](/wiki/Computing_Machines).
+## See also
+- [Early Computers](/wiki/Early_Computers)
+- [Processor Design](/wiki/Processor_Design)
+- [System Architecture](/wiki/System_Architecture)
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