If you are using serial port (COM1), problably your cable doesn't have flow control. You need a cable that use RTS,CTS and DSR. If you are using paralell port, make a change to serial port.
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If you are using serial port (COM1), problably your cable doesn't have flow control. You need a cable that use RTS,CTS and DSR. If you are using paralell port, make a change to serial port.