Hyper-v Serial Port Modem

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Anyone who has used Virtual PC / Virtual Server for a while will have got their head around the fact that you cannot access physical hardware directly from the virtual machine – with the exception of devices connected to a serial or parallel port. Well, as a number of people have discovered there is an interesting exception for ‘internal modems’. These are modems that are usually on a PCI card in the physical computer – or on a PCMCIA card in a laptop.The trick here as that internal modems almost always implement a hidden serial port – to which the modem is hardwired. This is true even of WinModems.As such – all you need to do is to figure out which COM port is used by the internal modem (poking around under Device Manager will usually get you the answer quickly) and map that to COM1 in the virtual machine. You can then just use a ‘generic modem’ configuration in the virtual machine to get this to work.Cheers,Ben. My laptop has an 'Agere Systems AC’97 Modem', which I believe is a modern incarnation of the Lucent WinModem. If you look in its device manager properties, Modem tab, it says 'Port: COM4'.

Hyper-v manager portPassthrough

Hyper-v Manager Port

I can connect to it in HyperTerminal using 'COM4' – ATH returns 'OK'.My 'Nokia Bluetooth Modem' has Port: COM0 though, maybe because it’s not connected right now.At a past project, I had an 8-modem PCI card, and it did create 8 additional COM ports. Together with the 2 real ports, 1 other PCI modem and 2 USB modems, I ended up with COM13. Of course, next door was the guy with the 128-com port card. Yes, I have used WinModems like that in the past, PCI, Connexant & Lucent ISTR.The most common problem then is that Windowes recognises the modem using PnP & tries to install the drivers for the WInModem hardware interface – which isn’t virtualised & will not work.The trick is to either use a Standard Modem driver & enter ones own AT string, or else choose the driver for another modem which has a similar AT command string. That was fairly simple for the Connexants where the AT command set is similar or identical – a bit more difficult for the Lucent. I also remember getting a USRobotics WinModem to work- the trick there was just to choose a modem driver from the right code base Courier/Sportster, with their different S-Register sets.