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PortTest Diagnostic Utility
PortTest is a DOS program that can be used to test standard serial ports. Including DFlex and DFlex4/104 (PC/104 bus) serial ports. It performs loopback ( tx->rx ) and modem signal tests in single or multi-pass mode. The results can be written to a time stamped log file is desired. By default it will prompt you before testing each UART. If the user only has one loopback connector this gives them an opportunity to move it to the next port being tested.