>One thing though, this type of emulation drives me nuts,
>I have a number of commercial stuff based on the fdti-chip,
>emulating com-ports, and it seems to change com-port each
>time it's used, its very frustrating.

That occurs when there is no unique serial number in the port. That is why
the FT232A and B devices have an external EEPROM, to contain the OEM
configuration data.

It can also be a problem if you have plugged the device in once, and then
unplug it and plug into another USB port on the host - voila yet another COM
port, different number to where it was plugged before.

The new FT232R chips have unique serial numbers in them to stop this
problem.

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