Hercules III User Manual Rev A.2
www.diamondsystems.com
Page
36
8.5
System Reset
Hercules III contains a chip to control system reset operation. Reset occurs under the following conditions.
•
User causes reset with a ground contact on the
Reset
input
•
Input voltage drops below 4.75V
•
Over-current condition on output power line
The ISA Reset signal is an active high pulse with a 200ms duration. The PCI Reset is active low, with a typical
pulse width duration of 200 msec.
9. BIOS
Hercules III uses a BIOS from American Megatrends modified to support the custom features of the SBC.
9.1
BIOS Settings
To change the following BIOS settings, press Del during system startup power on self-test (POST).
9.1.1
Serial Ports
The address and interrupt settings for serial ports COM1 and COM2 may be modified. COM1 and COM2 address
and interrupt settings are configured using the Advanced, Advanced Chipset Control, I/O Chip Device
Configuration menu.
The addresses and IRQ selections of COM3 and COM4 are fixed.
9.1.2
LCD Video Settings
Hercules provides direct digital support for LVDS-based LCD interfaces only. As such, there are two settings that
affect this support during BIOS boot.
Boot Video Device
– By default, this is set to “AUTO”. With the AUTO setting, the system attempts to identify an
RGB monitor (via DDC). If no RGB monitor is detected, the system enables LCD support. If you choose to use
the LCD display regardless of standard monitor connection (i.e., with both connected at once), set “Boot Video
Device” to “Both”.
Panel Type
– This setting defaults to “7”. Do not alter this setting unless specifically instructed to do so. This
set
ting affects the LCD display modes supported; mode “7” is the only setting currently supported. Not all LCD
displays are supported.