Hi Holly, there's no UI to do this yet, as you found out.
By default, you don't need to do any config, at least on Linux. COM1 defaults to /dev/ttyS0, COM2 to /dev/ttyS1, and so on. LPT1 defaults to /dev/lp0.. you get the idea.
If you want to change it, you can create a link in .wine/dosdevices from, say, com1 to the device you want it to use. So if for example you wanted com1 to be /dev/cua0, you should have this in dosdevices: lrwxrwxrwx 1 juan juan 9 Oct 4 08:15 com1 -> /dev/cua0
Hope that helps, --Juan
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