Troubleshooting
RUBY-D716VG2AR User’s Manual 5-3
time when system appears to be unstable in boot up sequence.
Auto Detect Hard Disks
In the BIOS => Standard CMOS setup menu, pick up any one from
Primary/Secondary Master/Slave IDE ports, and press “Enter”. Setup the selected
IDE port and its access mode to “Auto”. This will force system to automatically pick
up the IDE devices that are being connected each time system boots up.
Improper disable operation
There are too many occasions where users disable a certain device/feature in one
application through BIOS setting. These variables may not be set back to the original
values when needed. These devices/features will certainly fail to be detected.
When the above conditions happen, it is strongly recommended to check the BIOS
settings. Make sure certain items are set as they should be. These include the COM1/
COM2 ports, USB ports, external cache, on-board VGA and Ethernet.
It is also very common that users would like to disable a certain device/port to
release IRQ resource. A few good examples are
Disable COM1 serial port to release IRQ #4
Disable COM2 serial port to release IRQ #3
Etc…
A quick review of the basic IRQ mapping is given below for your reference.
Interrupt Request Lines IRQ
IRQ#
Current Use Default Use
IRQ 0
Unused System Timer
IRQ 1
System ROM Keyboard Event
IRQ 2
【Unassigned】
Usable IRQ
IRQ 3
System ROM COM2
IRQ 4
System ROM COM1
IRQ 5
【Unassigned】
Usable IRQ
IRQ 6
System ROM Diskette Event
IRQ 7
Unused Usable IRQ
IRQ 8
System ROM Real-Time Clock
IRQ 9
【Unassigned】
Usable IRQ
IRQ 10
【Unassigned】
Usable IRQ
IRQ 11
【Unassigned】
Usable IRQ
IRQ 12
System ROM IBM Mouse Event
IRQ 13
System ROM Coprocessor Error
IRQ 14
System ROM Hard Disk Event
IRQ 15
【Unassigned】
Usable IRQ
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