post4dPCI POST Code Display POST4D During the Power On Self-Test (POST), most PC BIOS write diagnostic codes to port 80h or 84 (jumper selection). Use POST4D to display these codes onpost4d PCI POST code display; Status EOL, available while supplies last. Part numbers post4d = PCI POST code display, RoHS compliant Use with postrd: Spec 5V PCI interface (not