On my Win7 64-bit, doing just one or the other does nothing. Both are required.

1. set the "devmgr_show_nonpresent_devices" environment variable to 1
2. enable the "Show hidden devices" setting

Jim KC9HI


On Mon, Mar 31, 2014 at 2:43 PM, Milton Hywatt <mhywattt@yahoo.com> wrote:
There is a shortcut to that. In device manager choose View
in the toolbar and select show hidden devices. Windows likes
to keep a list of all the devices you plug into USB ports in
the registry. That way when you plug a device in with a
unique ID (one that was previously used) it attempts to give
you hands free plug and play and maybe a search for a newer driver.
While that's fine with a true Prolific cable, it's not with a counterfeit
that needs a rolled back driver. It's best to keep all your cables plugged
in. If you have 4 cables like I do for different radios and a scanner,
buy a hub and plug your cables in it and leave them plugged in unless the
computer is off. All your configurations will remain the same and you won't
be playing driver musical chairs.

From: Bob Recny <n8sqt@arrl.net>
To: Discussion of CHIRP <chirp_users@intrepid.danplanet.com>
Sent: Monday, March 31, 2014 2:29 PM

Subject: Re: [chirp_users] programming help

FYI - In order to see the Windows "hidden" devices, you may need to set a global (System) environment variable:

Variable Name:  DevMgr_Show_NonPresent_Devices
Variable Value:  1

Log off and back-on to activate the new variable.

Bob Recny, N8SQT