12 front panel connectors (jfp1, jfp2 & jfp3), 1 power led and keyboard lock (jfp3), Table 2.1: ps/2 or atx power supply led status – Advantech AIMB-766 User Manual
Page 40: 2 external speaker (jfp2 pins 1, 3, 5 & 7)
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