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AST RESEARCH TECHNICAL BULLETIN TB-0064 10-11-84 SERIAL PORT WRAP PLUG In order to test the complete circuitry of the serial port on an AST board (when running IBM diagnostics) there must be signals coming into the port. This may be accomplished by installing a wrap plug on the serial port connector. To construct a wrap plug use a standard RS232 DB25 female connector and wire these pins together. 2 > 3 4 > 5 > 22 6 > 8 > 20