American Megatrends 42 Series, User Manual

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ADVANCED CHIPSET SETUP Options,
Continued
On Board Serial Port 2
This option enables or disables serial port 2 on the Mark V motherboard. The settings are I/O Ports 2F8h - 2FFh, 2E8h - 2EFh,
or Disabled .
If the configuration data stored in CMOS RAM is corrupted when the system is powered on, AMIBIOS automatically configures
onboard serial port 2 according to the presence or absence of serial ports on adapter cards in the expansion slots (offboard
serial ports). Autoconfiguration only occurs when CMOS RAM data is corrupted. The result for serial port 2 is:
If the Offboard
Serial Port is the Onboard Serial Port 2 is Autoconfigured as
None 2F8h Can be disabled or changed to 2E8h via ADVANCED
CHIPSET SETUP.
2F8h 2E8h Can be disabled via ADVANCED CHIPSET SETUP. If
changed to 2F8h, an I/O port address conflict occurs.
2E8h 2F8h Can be disabled via ADVANCED CHIPSET SETUP. If
changed to 2E8h, an I/O port address conflict occurs.
2F8h, 2E8h Disabled If changed to 3F8h or 3E8h, an I/O port address
conflict occurs.
P1 is serial port 2 on the Mark V Baby Screamer motherboard. If disabled through Setup, do not attach any device to P1 or to
any cable attached to P1. J21 is used to configure the interrupt request line (IRQ) for onboard serial port 2. The J21 settings
are:
Jumper Pins Shorted Description
J21 Pins 1-2 IRQ4 selected for onboard serial port 2.
J21 Pins 2-3 IRQ3 selected for onboard serial port 2 (Default).
If onboard serial sort 2 is disabled, you can remove the jumper block from J21 to disable the onboard serial port 2 interrupt.