The MTH DCS website has a lot of info and more so in Barry Boskowitz's DCS books. MTH explains and links to their recommended 9pin serial to USB adaptor(s) and there are a number of threads w/i the DCS sections of this forum that both guide and provide online links to those products you might need. Also a quick amazon search for 9 pin serial to USB pulls up a bunch that you can pick from and likely have delivered w/i a day or two.
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