What is windoes doing?

Bill Degnan billdegnan at gmail.com
Mon Nov 19 12:12:31 CST 2018

Every time you unplug and re-plug a USB serial cable you cause the system
to create a new IRQ address for it, called COM5, 6,7,8,9 etc.  If you do
the thing where you "remove usb devices safely" routine you can avoid this.

On Mon, Nov 19, 2018 at 12:13 PM geneb via cctalk <cctalk at classiccmp.org>

> On Mon, 19 Nov 2018, Ethan via cctalk wrote:
> >> I have a question. I use the USB port for serial. In my program, I use
> a
> >> fixed com port. When going to the control panel, I find that I see (in
> use)
> >> tags on some of the com ports. I'm the only one currently using the com
> >> ports but recently another (in use) showed up, requiring me to modify
> my
> >> program to use another com port. How does one unuse a com port? how do
> I
> >> find out what is using it so I can stop it? I'm using windows 7
> >> professional. Has anyone else had this problem? Dwight
> >
> > Do you unplug the USB to Serial dongle with a terminal program open?
> >
> FYI, "In Use" doesn't mean the port is actively used by another process,
> it means that the /name/ has been assigned and isn't available to assign
> to a new COM device.
> g.
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