Post4d
From ALIX Board, WRAP Board
Specification
During power on self-test (POST), most PC BIOSes will write diagnostic codes to port 80h or port 84h (jumper selection). Use post4d to display these codes on a dual digit LED display. Additional LEDs indicate the status of the power supply rails. Convenient business card size.
POST codes
A comprehensive table of POST codes can be found at BIOS central.
Schematics
