This is the DoubleSeven board for the entire Apple II series of computers.  The DoubleSeven board once installed in Slot 7 of your Apple II allows two boards to share the Slot.  Each card is then selectable via the switch on the DoubleSeven board and the LED lights to show you which card is active.

Produced by James Littlejohn of >8bitsystem.com< and licensed, distributed and supported exclusively by ReactiveMicro.com.