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Definition: POST code

(Power On Self Test code) A proprietary number generated by each PC BIOS vendor indicating the current diagnostic test being taken at startup. The results are displayed on a small readout on a POST card that is plugged into the peripheral bus. The last POST code displayed before the system locks up identifies the problem area. One might ask why the video system was not the first test so that the remaining POST codes could be displayed on the computer's monitor. Then again, one might not. See POST card.