Intel Desktop Board 21 B6 E1 E2 Manual [TESTED]

This marking is frequently seen on era motherboards. Based on hardware listings, boards carrying this code often feature:

Intel prints an "AA" number (e.g., AA# E12345-001 ) on a barcode. This is more accurate than the model name. Intel Desktop Board 21 B6 E1 E2 Manual

The Intel manual includes a specific pinout for the (9 pins, row of 5 + row of 4): This marking is frequently seen on era motherboards