For the Apple II series
This rare Sequential Systems Q system printer card is used as a printer server for up to 4 computers in the Apple II family. Each //e, for example, would need it’s own Q – Print or compatible card and cable to go to the Q – System card residing in one of them. Then one cable would go out to the printer. More information can be found at http://www.decodesystems.com/help-wanted/sequential-boards.html
Card is currently untested and Sold as-is.