Teknor Industrial Computers VIPer 821 Technical Reference Manual page 29

Connections for speaker, reset and user switches, and hard drive activity LED are available
through the Kdb/Spk/IO J3 connector. Signals can be issued using the keyboard cable:
#150-018-01, provided with the board.
SETUPS
Related Jumpers
No jumper setting is required.
BIOS Level
No BIOS setup is required.
MAKING CONNECTIONS
When using the #150-018-01 keyboard cable, signals are issued as follows:
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No external limiting resistor is required while connecting the HD Activity LED. A 330 ohm
resistor is integrated onboard.
  
 
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