We recently replaced our bar code scanners. Our old ones are up for grabs if anybody wants. They are 2 Metrologic MS951 scanners. These require serial or PS/2 ports. I've also used a PS/2 to USB adapter with mixed results (worked on one computer, not on another). Picture in the link. Thanks! http://hlpl.org/wp-content/uploads/2017/03/IMG_20170315_143955126.jpg -- Brandon Richards Technology Coordinator/Trainer Houghton Lake Public Library 4431 W Houghton Lake Dr Houghton Lake, MI 48629 989.366.9230