Chapter 1 Hardware Installation
25
Step 5 Attach Cables,
Continued
PS/2 Mouse IRQ
J19 is a three-pin berg that enables the PS/2 mouse interrupt (IRQ12). Short
Pins 2-3 of J19 to enable IRQ12 as the PS/2 mouse interrupt. You should
always short Pins 2-3 to enable the PS/2 mouse interrupt. The only reason you
would ever have to short Pins 1-2 is if you wanted an adapter card on the ISA
bus to use IRQ12. You would then have to set the
Mouse Support
option in
Advanced Setup to
Disabled.
J19 Pins 2-3 Shorted
IRQ12 used for PS/2 Mouse
J21 Reset Switch Connector
J21 is a two-pin single-inline berg that is attached via a cable to an
externally-mounted reset switch.
When the reset switch is pressed, the system performs a hard reset. Pin 1 is
ground and Pin 2 is Hard Reset.
J23 Speaker Connector
J23 is a four-pin single-inline berg that is optionally attached via a
cable to a standard system speaker. AMIBIOS signals hardware problems
through the speaker. Pin 1 on the motherboard is identified by the arrow on the
white box around the berg. The motherboard also has a built-in speaker
mounted on the motherboard.
Pin
Description
1
Data Out
2
Key
3
N/C
4
VCC
Cont’d
