IBM PCM-6890B, All-in-One FC/Socket 370 Celeron Front panel connector CN7, Speaker, LED interface

Front panel connector (CN7)

Next you may want to install external LEDs and switches to monitor and control the mainboard. These features are completely optional. Install them only if you need them. The front panel connector (CN7) is an 8-pin male, dual in-line header and provides connec- tions for a speaker, hard disk access indicator, and an input switch for resetting the card.

Front panel connector (CN7)

Pin	Signal
1	HDD LED- (Hard disk active)
2	HDD LED+ (VCC)
3	Speaker- (GND)
4	Speaker+
5	NC
6	GND
7	Reset switch+
8	Reset switch- (GND)

Speaker

The mainboard can drive an 8Ω external speaker at 0.5 watts. If there is no external speaker, the PCM-6890B provides an onboard buzzer as an alternative.

LED interface

The front panel LED indicator for hard disk access is an active low signal (24 mA sink rate).

26 PCM-6890B User Manual