AAEON EMB-B75A - Manual (Page 21)

2-13 Chapter 2: Motherboard information
2. AT Mode (ATMODE)
AT MODE 1-2
ATX MODE 2-3
3. COM1 Ring/+5V/+12V selection (COM1_VSET1)
+12V 1-2
+5V 3-4
Ring 5-6
EMB-B75A COM VSET connectors
PIN 1
+12V +5V RI
+12V +5V
RI
Com1_Vset1