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The DEC DDCMP Protocol

Digital Equipment Corporation (DEC) developed a character-oriented protocol called DDCMP (Digital Data Communications Message Protocol) in 1974. DDCMP links DEC computers and peripherals.


DDCMP, being the "new protocol on the block" incorporated many features that set it apart from IBM Bisync.

General Frame Structure

The following diagram depicts the fields in a DDCMP message.

DDCMP Protocol SpecificationGo here for the DEC DDCMP Protocol Specification

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