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TDDCOM is a communication program enabling a personal computer to transmit and receive via its RS-232 port Baudot-coded five-bit serial data at 45.45 bits per second (the code, data transfer method, and data rate TTDs use. COMPATIBILITY: For use on IBM and compatible computers. SYSTEM REQUIREMENTS: MS-DOS or PC-DOS, version 3.3 or higher. A color monitor is not required.