On Thu, 2007-01-18 at 12:40 -0700, Bob Axtell wrote:
> John Pfaff wrote:
> > I have a modem installed, but it's internal and uses COM3.
> > I haven't been able to install the tablet driver, because it tells me 
> > that COM1 is not available.
> > Other programs (Hypter Terminal, Tera Term) tell me COM1 and COM3 are 
> > available (the only two ports on the system), but can't use either one 
> > because the "telephony device is in use".
> > What I'm really looking for is a way to tell what process has the serial 
> > port locked.
> >
> >   
> COM1 and COM3 share the safe interrupt port. So when COM3 is used, COM1 
> is used as well.

Before the days of PCI and interrupt sharing that was true.

However, assuming the com ports are PCI devices (whether physically in a
PCI slot, or simply virtually hanging off the PCI bus in the form of
being built in to the south bridge), Windows should have zero problems
with them sharing the same IRQ.

TTYL

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