in reply to Win32::SerialPort with ports > 4

Ok, I reinstalled the card, swapped some cables around but it's still a no go.

In the registry is:
\Device\Serial0 ... COM1
\Device\Serial1 ... COM2
\Device\vspciser0 ... COM4
\Device\vspciser1 ... COM5
Winachsf0 ... COM3

The setup runs fine on COM1 and COM2, and when on COM4 or COM5 the script returns no errors when opening the port but still never "sees" any data on the port. If I shutdown the script and launch the win32 app it reads the waiting data.