If you are getting a lot of errors or comm overruns, reduce this speed to 57600 or lower. Also, there are several other items to check under the Connection tab. Also make sure that Cancel the call settings are enabled and at least 60 seconds is selected. A time-out less than 60 seconds may not be enough. Next, click the Advanced button and make sure the following settings are enabled.
Error control is essential for high speed operation, same for flow control.
The settings above are what I recommend for proper modem communications. After you ve set these preferences, click on the port settings button and make sure that you ve enabled 16550A mode. Also set your transmit and receive buffers to the maximum settings. This takes the most advantage of the uart s buffers. Last on this list is VGA hardware acceleration.