This format appears on older Intel Desktop Boards (DG, DH, DQ series).
Intel desktop boards use beep codes or LED POST codes (on high-end boards). 01 21 b6 e1 e2 could represent (often in hex). ER might stand for “Error.”
These trailing hexadecimal characters comprise the unique extension identifier for your specific network card. Typographical errors often occur when reading faded motherboard stickers, where an 8 looks like a B , or a D is misread as an R . intel desktop board 01 21 b6 e1 e2 er
These numbers usually denote the hardware revision and the specific production batch. A higher number typically implies a later revision of the board (addressing initial bugs or manufacturing updates).
In hardware diagnostics software (like i2cdetect on Linux or hardware monitoring tools on Windows), memory modules and EEPROM chips are identified by hexadecimal addresses. This format appears on older Intel Desktop Boards
Example: 01 21 B6 E1 E2 ER
Understanding this specific board identification sequence helps you properly maintain, troubleshoot, or upgrade a legacy computing machine. Technical Overview and Specifications ER might stand for “Error
Often indicates S3 Resume or memory-related errors during the boot sequence.
The identifier (often seen in parts as 21-B6-E1-E2 ) typically refers to a legacy Intel Desktop Board from the 2nd Generation Core processor era .