Is this slot usable? It doesn't have the connector

slot connector   Dan slot chili

These are the surface mount 50 pin Board to Board Double Slot Male Connectors found on the Alchitry FPGA boards

F31609 - 15S, 30S, 40S UNIVERSAL T-SLOT CONNECTOR A Universal T-Slot Connector used to connect t-slotted framing without the need for extra machining  30mm SocketEnhance your electronic projects with our versatile 5PCS Edge Card Connector PCB Gold Finger Slot Socket, available in a range of 8-40 pin

伊奶蝶 Wide Slot Width Connector Type Photomicrosensor from OMRON MISUMI offers free CAD downloads, short lead times, competitive pricing, 693 SERIES 100 PIN SLOT CONNECTOR Toyo is a trusted name and a leading supplier of automation and mini round shell connectors in India We are your one-stop