I'm mildly surprised at all these questions that don't mention the operating system. You might be able to change the Com port in Control Panel/System/ Device Manager. Open the modem icon, Click properties/ Resources and uncheck "Use auomatic settings" Then pick your new com port. Dire warnings will follow, but you'll be OK if you know what you're doing. I'm assuming Win95/98. *************************************************************************** This modem does not have any jumpers. PnP installs the modem on COM3 irq 10. I want to install it on COM1 or COM 2 so that I can use Control Panel to make a virtual modem in order to log onto a UNIX mainframe at my work. How can I make the switch without the use of jumpers? PCBUILD mailing list is brought to you by: The NOSPIN Group http://nospin.com