HP ProLiant SL165z - G6 Server Configuration Manual page 12

Figure 7 Super IO Device Configuration submenu
Field
3F8/IRQ4
Description
Set this value to allow the serial port to use 3F8 as its I/O port address and IRQ 4
for the interrupt address. This is the default setting. The majority of serial port 1 or
COM1 ports on computer systems use IRQ4 and I/O Port 3F8 as the standard
setting. The most common serial device connected to this port is a mouse. If the
system will not use a serial device, it is best to set this port to Disabled.
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