E1 E2 Manual Fixed: Intel Desktop Board 21 B6

The identifier (often preceded by /21 ) is a regulatory marking found on several vintage Intel motherboards, most commonly associated with the LGA 1155 socket generation

USB 2.0 (and sometimes USB 3.0), Ethernet (RJ-45), and integrated VGA/DVI/HDMI outputs. Key Sections of the Manual Intel Desktop Board 21 B6 E1 E2 Manual