Annabelle, For USB you don't use a switch, you use a powered hub. That expands the number of ports. I don't understand your need for a serial port for the monitor. A monitor does not use a serial RS-232 port, it uses a special 15-pin connector configuration. For that, you can purchase a special switch, but don't buy a "serial port" switch. Buy a video monitor switch. Dave Created in the Audio Recording and Mixing Studios, San Jose, California ----- Original Message ----- From: Annabelle Susan Morison To: ddots-l@xxxxxxxxxxxxx Sent: Wednesday, August 18, 2010 20:46 Subject: [ddots-l] USB Switches Hi, it's Annabelle. Does anybody know where I can find an A&B Switch that supports both USB and Serial Ports? The reason why I ask is because I'm eventually going to purchase the Rockbox I7 from PC Audio Labs, and my monitor is powered by a serial port connection. Also, I'm going to hook up my computer keyboard, my mouse, and both my printers to the USB ports. Does anybody have any suggestions for me?