Compaq 164SX - Manual (Page 34)

2–14 System Configuration and Connectors
AlphaPC 164SX Connector Pinouts
2.7.12 Microprocessor Fan Power Connector Pinouts
Table 2–13 shows the microprocessor fan power connector pinouts.
2.7.13 Soft Power Connector Pinouts
Table 2–14 shows the soft power connector pinouts.
2.7.14 Multipurpose Connector Pinouts
J20 is a multipurpose connector that provides pins for the following functions:
• System speaker
• LEDs for power and the EIDE drive
• Buttons for reset and halt
Table 2–15 shows the multipurpose connector pinouts, and Figure 2–3 shows the
connector layout.
Table 2–13 Microprocessor Fan Power Connector Pinouts (J14)
Pin Signal Description
1 +12 V dc —
2 FAN_CONN_L Fan connected
3 Gnd —
Table 2–14 Soft Power Connector Pinouts (J1)
Pin Signal Description
1 Input System power on/off
2 Gnd —
Table 2–15 Multipurpose Connector Pinouts (J20) (Sheet 1 of 2)
Pin Signal Description
1 Gnd —
2 HALT_BUTTON
1
Halt system
3 Gnd —
4 RESET_BUTTON Reset system
5 HD_PU Hard drive power-up
6 HD_LED Pull-up to Vdd