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I have Ubuntu 9.10 with a Windows XP Virtual Box 3.0.8_OSE r53138

Simple RS232 Modem (USR 56k)
Reveals
[ 0.562093] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[ 0.562365] 00:0d: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
Reveals
crw-rw---- 1 root dialout 4, 64 2009-12-11 14:49 /dev/ttyS0

I am a member of dialout

In my guest OS I see the Com port is there... but I cant query the modem on it.
I tried to install a generic modem on it just to try and query it. but to no avail.
any thoughts?

Have you set the Settings>Serial Ports>Port Mode: to 'Host Device' and set Port/File Path: to '/dev/ttyS0' ?

Yes, That is correct....



COM1, Host Device (/dev/ttyS0)

I found a USR Driver.. and have the correct modem installed as well...

It appears I can query the modem... I see a light turn on.... But Windows says it does not get a response