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Re:History of the IBM PC, part two: The DOS empire strikes by WalterBright on Tuesday August 01, 2017 @04:51PM (#14905182)
DEC had COPY on their PDP-10 operating system at least as far back as 1975 when I started using it. DOS clearly had a lineage going back through CPM to DEC.

The CR-LF line endings also trace their way back to DEC.

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