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Legacy DOS program that uses serial communication will not work above 19,200 bps

I have to support a legacy DOS program under Win2k. It uses serial communication. It will not work above 19,200bps and is flaky abobe 9600bps. How can I tell NTVDM not to intercept/filter accesses to COM1?

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I thought DOS was the Spanish word for the number 2! It's been quite a while since I even thought about a DOS program under Windows. However, have you tried setting the COM port baud rate in the Device Manager. I seem to remember something from a million years ago that the default is 9,600 and to run faster you need to manually set it to a higher value.

This was first published in April 2002

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