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BIOS POST card for ISA bus. Two seven-segment displays show the POST-code. Four LEDs display presence of +/-5 V and +/-12 V.

BIOS POST card for PCI bus

BIOS POST card with connectors for the PCI (bottom), PCIe (top) and LPC (left 2 mm and right 2.54 mm) busses

In computing, a POST card is a plug-in diagnostic interface card that displays progress and error codes generated during power-on self-test (POST) of a computer. It is used to troubleshoot computers that do not start up.