Say Mark
There is a blank gray plate above the control module, held by two small phillips screws; the control module is the one with the ready lights on the back of the unit. Behind the plate are slots for two half-width cards, the acon board goes in the outside slot. Some acon boards are keyed and may not seat properly; you can cut out the tabs on the card connector for acon. Your main projector software must be v2.0 or higher; some early control boards may need resistors changed to work properly.
Tim at E-Tech Phoenix