Audio Connector(Cn3); Floppy Connector(Cn4) - Aaeon PCM-6897/L Manual

Compact Board
3 +12V
4 -12V
5 GND
6 GND
7 GND
8 GND
9 -5V
10 +5V
11 +5V
12 +5V

2.16 Audio Connector(CN3)

The PCM-6897/L provides all major audio signals on a 14-pin
flat-cable connector, CN3. Attach the Mic In, Line In, and Audio
Out to the corresponding pins as shown in the following table.
Pin Signal
1 MIC_IN
3 LINE_IN_GND
5 LINE_IN_L
7 LINE_IN_R
9 LINE_IN_GND
11 LINE_OUT_L
13 LINE_OUT_GND

2.17 Floppy Connector(CN4)

With support of different types of floppy, you can simply adopt any
of the combinations of 5.25" (360 KB and 1.2 MB) and/or 3.5" (720
KB, 1.44 MB, and 2.88 MB) drives onto the mainboard.
A 34-pin daisy-chain drive connector cable is required for a
dual-drive system. On one end of the cable is a 34-pin flat-cable
Chapter 2 Quick Installation Guide
P C M - 6 8 9 7 / L
Pin Signal
2 MIC_+2.5V
4 CD_GND
6 CD_IN_L
8 CD_GND
10 CD_IN_R
12 LINE_OUT_R
14 LINE_OUT_GND
2 - 13