Port 80 Display
A two-digit display found on some motherboards that display the port 80 code sent by the BIOS when the computer does not pass POST. These displays are helpful for diagnosing what in a computer may be preventing it from properly booting. For motherboards that do not have a port 80 display listening to the beep code can help identify the error.
A technician or someone who fixes computers may also use a POST card, which has a Port 80 Display to display the port 80 code. The picture is an example of a POST card that plugs into the PCI slot and will identify the code sent by the BIOS on the Port 80 display.
Tip: A POST card may also be referred to as a POST reader, checkpoint card, and port 80h card.